Back on the 13th, about when it went active, I reserved my characters on Mankrik (normal PvE realm) when it was still listed as Medium Population. Even as an Alliance player, I have regard for Mankrik’s wife so that was a no brainer for me, even though I suspect it will be a Horde heavy realm. PvP was never my favorite thing to do, as I am much more into the lore of the game. Make no mistake though, I will roll a PvP realm sooner or later. A realm you may want to avoid for awhile is Faerlina (PvP), as word has spread that the majority of players there are a bunch of streamers and followers.
I am sure more servers will be added. No need to sweat too much.
the reason they are making servers so limited is so we can fill them out, so that they (hopefully) have a steady long term player base on those servers in the future c: