According to a user on popular forum NeoGAF, the PS3 motion controller will include a Nunchuk add-on.
The user known as “ichinisan”said he’d seen pictures of the Wand and Nunchuk. He also claims the add-on has an analog stick and X and O buttons, plus the L1 and L2 buttons are underneath the D-Pa and that it’s as long as the Wii’s version.
The Wand will also feature “one very big buttun on top”; with the trademark facebuttons of X,O, Triangle and Square add-on; and a trigger know as “T”.
We should get some more information concerning this rumor at GDC this week. Exciting times.

If Sony wants the “Arc” to be used for more than on-rail experiences, it’s going to need something like an analog stick so players can move.
Interesting, but from a user on a forum? More info at GDC would be nice!
O and i mean that in a good way, I’m looking forward to the Arc.
I agree, but NeoGAF is known for breaking a lot of truth..