They just didn't want to use "Evolution" or "Final Tuned" again, I guess. We all knew this was coming; Reno on GAF said there would be a big update like this with two new characters a couple of months ago, right after version D was announced.
This is for arcades by the way, guys. All this new info is coming from the AOU show. Don't expect to hear anything about home versions.
Mupupe: It's the usual fighting game update. A couple more characters, tweaks/adjustments, some new moves, and the like.