To me, the formula's simple... Warrin' and whorin' but never borrin'. Landing at Point Rain is, for me, the benchmark that they've never really reached with anything since. Close at times, but not quite. It's a massive galactic war, and they avoid it too much.
I want to see Clones... at war...
And since Star Wars is in the title, I'd like to see more of this take place in space too.
Starfighters, **** blowing up, Clones dying, Clones killing droids, Clones going crazy with their skills, Seppie leaders destroying Clones (Playing up the "heroes on both sides" thing is always fun to see when the heroes are the seppie leaders), planets being devastated by the war.
3PO/R2 in an Alice in Wonderland type thing, meh...