Whats this games learning curve like? More difficult than SF4?
Whats it like doing combos, compared to SF4? Timing, or button mashing?
Whats thing simple vs normal mode thingy like?
Also, http://www.youtube.com/watch?v=yUu334LZW7Q&feature=player_embedded
Simple mode is just mindless button mashing. Combos are one one button, specials on another, and Hyper combos just take one button press. It even team aerial combos for you. If two newbs are against each other, and one is on simple, and the other is on normal, the one on simple will win 90% of the time.
Once you learn how to defend against it though, people who play on simple mode are your punching bags.
As for combos, it normally goes L-M-H-S-M-M-H-S. And after that you can use an assist or an attack to OTG and partially continue the combo. You can also replace the last S with a Hyper Combo. Some characters have extremely strict timing, while others are a bit more lax. You can also team aerial combo by hitting special and a direction, the doing the second half of that combo again. You can do it once more, and end with a hyper if you want. The aerial combo builds a lot of meter if you send them down every time you switch, but TACs can be defended by pressing S+the same direction your opponent presses. That does a fair amount of damage and puts them on the defensive.
Learning curve I would say is easier initially, and then gets harder as you learn the extended combos.