Yes.
Yes, It is out on Wii and XBox(I think)
Yes
you need certain characters
You go to the maths room. (classroom) (in both no. 2 and no. 1 on wii)
Use the staff of ra to unlock the gate
After you finish the second level in the temple of doom area you can purchase him.
just beat the story mode levels.
Wii Version: 82RMC2 If you need more go to IGN.com.
He's in the snowman on Indiana Jones 2.
No, it only comes for ps3, wii, Nintendo ds, psp, x-box 360, and PC.
On DS, just buy her when you unlock her character and have enough money. On Wii, she will unlock automatically.