As for DX3, I think we are essentially going to get a repeat of DX2. All the stuff we've heard about regenerating health and how the first game was "too slow" suggests that this will be another game targeted towards casual gamers. Despite that though, it could still be a very good game.
"Casual gamers" is one way to put it. To be more concise and accurate, you can just say "console gamers". Regenerative health means that a game is for consoles, no exceptions to this rule. Just you wait until you load up the game, and "PRESS X TO DIVE TO COVER!" appears on your screen, and autoaim kicks in. Hell, they may even add slow motion where you can mark the enemies you want to shoot and just press a button to make your character do it automatically. But enough about Splinter Cell Conviction...

If you're a fan of a series of games like Deus Ex, or the AVP series for example, and you see a new game in the series coming out soon, do not buy it. The thing is, it's console-season. Classic games are making a comeback, but with distilled gameplay and thoroughly saturated with mediocrity.