It started with me yesterday in timewalking dungeons, happened in every timewalking dungeon after it started. I think first was Stratholme. I logged out for the night and started doing normal TWW dungeons today and it began OK, did like three with no issue. I got into a Cinderbrew Meadery group, which I could only see one other player. This really stinks because not getting heals or can’t be resurrected really stinks as DPS. 
Please ignore this post, can’t edit or delete and some reason it defaulted to a character I don’t play. 
Not just timewalking. I just did an Ara-Kara heroic where I couldn’t see anyone else. I tried porting out and back in, something that fixed a similar issue earlier in a timewalking run, but this time it did nothing. The group remained invisible to me.
Having the same issue in TW dungeons on an alt I am leveling.
Same for me. I was doing timewalking last night on my level 70-something hunter. The group I was with for the 4th dungeon re-queued together to do one more. We got Straholme as our 5th timewalking dungeon. Suddenly, the people I had just played fine with in Diremaul I could no longer see. As a hunter, I was alone and everyone was dimmed on my party bars as if they were out of range. There was a mage in the group who could see me, but I only “saw” them when they used mirror image, and I saw their clones. I just tried to follow the red ground effect to figure out where the DK tank was going. Healer couldn’t heal me.
I would wait to see where the DK was going, and I could see the groups of mobs in combat with my party, I just couldn’t see them. I was able to attack the mobs with them, but not interact with my party.
Now this morning it doesn’t matter which toon I log in on - I appear to be completely alone or phased out of seeing anyone. Most of my characters are in Dornogal, but I also experienced it at the celebration grounds. When I queue up for Headless Horseman it’s “fixed” but only temporarily. If I switch characters it’s back to being phased.
I’ve tried clearing wtf and cache, and have disabled all addons, /reload and restarted, etc. No luck.
Also had this issue in a timewalking dungeon this morning. Could only see 1 party member and was very confused.
Adding in as another vote of this. I’ve seen it in all different dungeons. The one thing that seems somewhat consistent is that there is always a hunter I can see (at least since I’ve been paying attention to the bug). Don’t know if that’s a factor at all, but it’s at least something I’ve noticed the past 3 times this has happened.
i am also experiencing this. Alot of people complaining about it in General chat also.
this needs to be fixed asap we cant do anything
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Strangely it “fixes” itself when I queue into Headless Horseman (I was able to interact with party members fine as a healer) and then when I left instance, suddenly I could see and interact with everyone in Dornogal again.
But it goes back to being broken/phased/whatever if I log out or switch toons.
Happened to me in TW Deadmines–i just followed the mobs that were in battle. Just got kicked from Dire Maul because I lost track of them. Both times could not see my party, just mobs
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coming back to say it’s happening in overworld for me as well now. Both in dorn and theater troupe I could only see spell effects from the other players and very rarely I would catch a glimpse of a pet or minion and then it would phase away again
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I tried two dungeons this morning. I queued up for TBC dungeons and could not see anybody, but I did see random dots on my mini map. I also saw mobs falling over here and there like someone killed them, but there was nobody around. This is dumb.
Happened just now in a Stratholme TW dungeon on a leveling alt. I could only see the other hunter in the group, the rest of the party showed as arrows on the map off in the distance. I thought it was just me and the other hunter soloing mobs to catch up with the party, then I realized I could see the paladin’s spell effects on the groups we were fighting. Reloading did not fix. The mobs and boss did not show that they were targeting the tank in my ui either.
Happened as well in strathholme.
We found a fix for it was to have the people affected teleport out using the groupfinder eyeball icon, and teleport back in. Then both could see each other and the rest of the group.
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Have the same issues, starting yesterday evening, but it only horde members. There visable in party frames but in open world, party, an raid there are invisible 
Just happened 3 LFRs in a row for me, had to leave the BRD one because there was a single person in my “phase” that I could actually see/interact with. Needless to say the group couldn’t even kill Darkvire since healer’s couldn’t see tanks.
Seems like this should be a pretty high priority bug.
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This. This seems to work as a temporary fix when it has happened to myself and other party members.
Having the same issue for two BG Blitz in a row.
Yah been happening to me last night and today as well in TW dungeons, on multiple characters.
This has happened to me several times this morning in TW dungeons. A guildy reported that it happened to him in a random BG, and with the reports here of current Heroic dungeons, it seems as if it’s a queued content bug.
A solution we’ve found is, for dungeons at least, teleport out and back into the dungeon. Multiple people might have to do it depending on who is visible and who isn’t. It seems to work. I don’t know of a temporary workaround for PvP until Blizzard fixes it.