[Update: Shows over, folks! Looks like this was more than Capcom wanted you to see. ]
Here it is, the first footage of Evil Ryu and the character that fans (such as myself) were calling “Oni Akuma” in Street Fighter IV: Arcade Edition. Well consider the Oni Akuma name dead, as according to these screens and videos, this new purple demon is named “Oni”. The new name fits, as he appears to be more fearsome and devastating than Akuma ever was (Shin or otherwise).
It could be that Oni is Akuma by a new name, or a new character entirely. I’d ask Capcom about it, but the last time I did, they gave me more questions than answers. For now, I’ll just revel in the fact that it’s looking like Oni could be the biggest badass in Street Fighter history.