Note that it is now 100% confirmed that larger, less agile characters have different combos than the smaller, quicker ones. So there are differences between characters now.
Oh, before I forget: Transformation update. When you have at least one favorite technique sphere stocked up, you can press R3 to transform up one form. BUT, if you press left, up, right, or down, you can transform into your first, second, third, and base forms, respectfully. Meaning that if you are playing base Goku and you press ^R3, he will turn SSJ2. Then, if you press <R3, he'll go down to SSJ, or you could go then to SSJ3 or base. So reverse transformations are possible.
AND, a new feature is available in MAX POWER mode. Besides being able to use combos that you couldn't use outside of MAX POWER mode, the [] button becomes an infinite chain attack, allowing you to build up your combo, while doing a bunch of damage.
The following are three of the most noteable of the combos, as I can't remember ALL of them:
1. []/\/\/\[]- A heavy finisher, a light blow, followed by three heavy blows and the last hit smashed your opponent away. By adding as many as three additional []'s at the beginning of the combo, you can increase the combo by that many hits.
2. [][][][] v/\ /\/\[]- This is my personal favorite. The first four hits are generally weak, but the v/\ trips up your opponent, the following two /\'s go into a teleport attack, then the last [] goes into a SECOND teleport attack, which can then be followed up with a Dragon Rush attack.
3. [][][][] ^/\ X/\[][][][]/\- Ultimate combo so far. Four weak attacks, ^/\ to knock 'em in the air, X pursues, /\ for a strong attack followed by four weak attacks and a finishing blow, straight into the ground.
There are MANY other combos, ranging from X/\/\, XO, to combining L2 with other buttons. Ex: After a Dragon Rush, /\X L2/\. I wish that I had been able to test these, but I didn't get many chances to play today. But tomorrow is the last day of Comic-Con, so there won't be many people there, so I should be able to have more on the combos tomorrow.
Also, I have witnessed taunting in Tenkaichi 2, but it was done by some one else, and not even HE knew how he did it, though he suspects it has something to do with the L1, since you can no longer break your lock-on by pressing L1 after you have already locked on.