3rd strike is going to be completely revitalized. GGPO, a solid trainer, uploads directly to youtube via console, the challenges from SF4, etc. I'm sure we'll certainly see it in offline tournaments, but having GGPO means that it'll actually be the first fighting game to be viable for online tournaments, which is huge. This will be the first fighting game that'll be taken online seriously, well in America, at least - Japan has their superior internet.
I'm looking forward to it, I never got around to the game when I was younger, but I'll be playing the hell out of it simply due to GGPO. Everything else is great too, but GGPO was the selling point for me. I can actually play competitively without getting off my couch, for once.
After this, GGPO will become the standard, sadly it was in the dark before and wasn't well known but once Capcom puts this out there not having GGPO is going to flat out kill any other fighters released in the future.