I figured it would probably come up sooner or later, so here's some articles relating to the current status of this potential game (i.e. rumors):
I'm glad to hear about the additional characters, ultras and return of the bonus stages, but since the initial mention of in-game video demonstrations for Trials, nothing else. This needs to happen.
Some speculate that this means Charlie is alive and will return. I don't think the game needs two Guiles. Sonic boom->dash forward->forward+medium punch/cHK is all I ever see from Guile players, but I guess that's really the only way to play him in IV (I admit I am guilty of this too).
The TGS only has 2 more days left, so if the promise that an announcement would be made there is true, we'll only have to wait, at max, two more days.