You can buy a digital version of 2.0 or 3.0 on most consoles.
My situation, for example:
Had 2.0 on the 360.
Bought 3.0's physical starter pack for Wii U, so we had a Wii/Wii U/PS3/PS4 pad and the figures.
Bought digital 3.0 for 360. Used 2.0 360 pad for playing that, along with the figures/playset from the 3.0 Wii U starter.
Full experience on both platforms.
Total stuff owned for that:
- 2.0 on 360 (game, pad)
- 3.0 on Wii U (game, pad)
- Digital 3.0 on 360 (game, uses 2.0 pad)
It works out well if you want to do multiple platforms but not double up on pads or figures, or plan on switching platforms in the future. I know my brother got 2.0 for his kids on their Wii and then got 3.0 digitally on their Wii U and used the same pad (then picked up the standalone Star Wars playset pack).
So if you don't want the included Clone Wars Star Wars pack you could buy 2.0 (comes with pad, Thor, Iron Man, and Black Widow) and then get 3.0 digitally for the upgraded toybox and new figures and playsets.