Doom Rocks looks to be a good assist still, and Hulk Rocks looked to be decent for characters that have 4-Way Mixups for that ambiguous nature.
Trish/Doom will probably be the de facto trap team nucleus, although if Dorammu gets a good enough set of assists, DorDoom can probably be the next BH/Doom.
If Dante’s Powerslide is fast, he’ll end up as CapCom AAA. If DP’s Shoryu has invincibility frames, he’ll end up as designated assist too, because it seems to be pretty fast.
Ammy/SixMachine Joe/Mighty Tornado Thor could be Team One Hit THC.
Trish’s Trap Assist will be a godsend for Thor/Skrull/Tronne/other grapplers.
X looks to move fast enough that any Projectile assist will give her some Sonic Boom shenanigans. Really, Sniktbub/Felicia/X/Chun are kind of interchangeable at this point, so if you back them up with, say, Morrigan or Ammy and a good AAA you have your rushdown team. Put Morrigan on point/use Chun/X’s dash tricks and you’ve got bootleg MSP.
If Hulk stops sucking, Hulk/Tron/Doom could be Team Z 2010. If he keeps sucking, Thor might work in Juggz’s slot.