Well, I'm not sure if I want to get CPP or not, and there are little advanced techs that may or may not return that will determine how I will like it as well(wavedash, DACUS, etc).
I didn't ever get into Melee that much, but I loved Brawl. Eventually, the slowness got annoying, so I just play Project: M, so I will try to match my controls for that.
No Circle Pad Pro:
A - Attack
B - Special
X - Jump
Y - Taunt/Grab(If DACUS returns)
L - Shield
R - Grab/Attack(If DACUS returns)
Circle Pad - Move(duh)
D-Pad - Quick Smashes/Taunts(If DACUS returns)
With Circle Pad Pro:
A - Attack
B - Special
X - Jump
Y - Taunt
ZL - Shield
ZR - Attack(If DACUS returns)/Undecided
L - Undecided
R - Grab
Left Circle Pad - Move
Right Circle Pad - Quick Smashes
D-Pad - Taunts
And who knows what the touch screen will let us do, probably a big button for Final Smash so it doesn't override a special, and maybe taunt, since you need them instantly, like sonicbrawler said.