Yep, it's confirmed:
*Online play:
Same stable net code from SSF2 HD Remix, player match, quarter mode/lobby system, leaderboards, trophies/achievements.
*HD upscaling options:
Real-time sprite filtering options: Crisp & Smooth. Higher-res backgrounds.
*Widescreen support:
Optional 4:3 field, new widescreen viewing angle.
*No unlocking:
All 56 characters, all colors, and all stages available from the start.
*Music Options
Custom soundtracks for both PS3 and 360 versions & music volume controls.
Bought.