does it have a slipcover?

100% sure that the 3-disc Blu-ray does, 99% that the 2-disc Blu-ray does not.

ok now whats the diff between the 2 and 3 disc set?

I don't know, but you'd probably get a better response from people who would know if you ask a mod to move your question to the HD/Blu-ray area instead of the DVD area.

Edited to add: I did a search for "Wall-E" and came up with this thread, which should answer your question:
http://forum.dvdtalk.com/dvd-talk/53...l-edition.html

Pretty sure the only difference is that the 3-disc has a Digital Copy, whereas the 2-disc does not. The 2-disc is a much more common release, and the 3-disc, when it can be found, is even harder to find with the slipcover. I have noticed that a lot of my local Walmarts carry it, however.

Disney tends to only include slipcovers on the initial batch of Blu Rays they release. After that, they all are just normal BD casing. (You can from time to time find ones with slipcovers are retailers who normally don't move BD's quickly, like WalMart, mom and pop stores, etc.

As Kory stated, the only difference between the two is that the 3-Disc set has a Digital Copy disc, and the 2-Disc set doesn't.

Unless you REALLY need the Digital Copy, I'd stick with the 2-Disc set, slipcover or not.

I have the 2-Disc Blu-Ray edition. No slipcover.

Maybe this should be in the covers forum?