Speed Meta might change a bit. Necro Speeds will still best in terms of XP/h in the long run. But that's just my guess.
If you want a spot in most groups, I would assume barb would be a pretty safe pick. With it's buffed Waste set, you're also good for speedy keyfarming an bounties. Might as well be a good DPS for early season speed GRs and will always be needed as support barb for higher GRs.
Apart from that, monks, wizards and necros will probably make it into most groups. I don't see crusader anywhere, but they might adjust the new set and new builds could arise, but I wouldn't count on it.
Edit: Ok, looks like there will be some nerves, so the stuff i've written up above might change.
I also want to see new meta for S19. Because:
- they will nerf star impact wizz,
- they will also nerf hard thorn necro,
- i also hear that they have nerf solo Barb so it will not be as OP as at ptr.,
We will see.
I wonder when they will lunch new patch Live?