Oh. So they introduce new characters in SF Alpha Anthology? That's actually a positive selling point for me. Does it include the old as well?
Alpha took place before SF2 (At least the story)
Quite a few characters were introduced here including Sakura, Dan and Rose.
Also, some characters return from Street Fighter 1 such as Gen, Adon and Birdie (I think Adon was in 1)
Lastly, some characters from Final Fight appear
For awhile, I think they were planning on calling FF Street Fighter 2... anyways.... Guy, Rolento, Cody and Sodom show up.
And that's just a few of the new characters
The game play is a bit faster from SF2, and the super gauges became very important as well.
Hope that helps