What hero will be next down the line.
Unfortunately, this is not the best place to discuss about the game features. The technical support forum is where players life myself and Blizzard Support Agents (who are different from the developers) to lend a hand for players who have technical issues (such as disconnections or game crashes) with Overwatch. I suggest posting your topic in the general discussion forum.
If in the event you are unable to post in the general discussion forums, please check this troubleshooting guide.
On a personal note…
There are many hoping for Echo, considering she was teased in last year’s animated short during BlizzCon…
That being said, don’t be surprised if we get another anticipated character like the Junkertown Queen or Mauga… or perhaps someone new entirely.
One thing is for sure, be sure to tune in for the Opening Ceremonies for BlizzCon as we will very likely find out about new content for Overwatch. Note, assuming nothing changes, watching the opening ceremonies for BlizzCon is free and does not require a BlizzCon Virtual Ticket.