MKX looks pretty next-gen, to me, which is why I think that if it ever comes to PS3 and 360 that it'll look pretty shitty.
The Fatalities and X-Rays are quite a step up from MK9 in terms of gore tech and actual visuals.
Guts being spilled in MKX don't look like a bunch of steaks falling out, like they did in MK9 (Skarlet).
As for games (IMO):
Injustice 2 is likely.
SM sequel doesn't seem as likely, given that it doesn't seem like they even want to take that risk with an action-adventure game, now that they are under WB.
OK, but they're still using UE3 with which can only do so much. Personally I was more impressed with MK9 when it came out visually than with MKX. The difference though is MK9 came out 4 years ago, when UE3 wasn't so dated. In comparison MKX uses the same tech with more modifications. Whatever they were, they definitely didn't impress that much, and certainly won't cut it in 4 years time. But that's just my opinion.
The fact is that UE4 is now available for devs, and from what I can see more and more developers are going for that option. I see no reason why not to, it's a fresh engine with some great potential and tools. Unless you're in the same position like Killing Floor 2 devs - UE3 already pushed to the limits + some UE4 tech incorporated + don't want to spend a few years learning and starting to convert the entire game into UE4...
I didn't mean a sequel for SM. Boon and NRS have been asked to death for a SM-type game. Obviously people want it, and I see no reason why WB would say "look guys, I know you make MK games for a living, but this one that people actually want? Skip it."