Capcom's Senior Manager Seth Killian spoke in Capcom Unity Boards about the new characters being added on Super Street Fighter IV. He also talked about a few other things, but here's what he said in his words:

In the character poll for Street Fighter 4, let's say that Cammy wasn't selected and Dudley won instead. If this happened, would there have been an extra character in Street Fighter 4?

Can Capcom tell us if Guy, Adon, and Cody will have the same moves and button inputs as they did in the Alpha series?

And can you say if you're planning on making Seth stronger?

To the first question, no, there wouldn't have been an extra character in SFIV, but there would have been a different character (with Dudley replacing someone else).

As for the Alpha characters move sets, there are some additions and changes, but anyone familiar with the characters original moves will be able to jump right in.

As for Seth... we'll just have to wait and see on that one.

Will there be a simple input option for special moves and ultras, like using the right analog stick or trigger buttons?

Street Fighter 4 was near unplayable for these kinds of gamers because of the inputs and insane timing on combos which required a $150 arcade stick plus months or years grinding away doing repetitive motions.

I'd agree that you're overstating the difficulty a bit, but that said, I sympathize. The short answer is that we're not planning on offering inputs like that in SSFIV, though there ARE easy special/super commands for Tatsunoko vs. Capcom, which in my opinion is a much better entry point for a fighting newcomer. Chain combos, easy-input specials (if you wish), etc. all give you a much better feeling early on if the world of fireballs and hurricane kicks is a foreign language. Try TvC or MvC2 — there's certainly plenty of depth, but the barrier to be able to do some basic stuff is lower.

Though it says nothing about Deejay or T.Hawk, these are still good news. I'm firing up my Street Fighter Alpha 3 copy and practicing with them and liked Guy's playstile a lot. What are your plans for getting ready to Super Street Fighter IV?

Source: EventHubs