A special collector's edition will go on sale for $100, while the normal version is expected to be $60. It contains:
The Art of StarCraft II: Wings of Liberty, a 176-page art book filled with illustrations and concept art that should make an excellent companion piece to the art books for the second and third installment.
2GB USB flash drive replica of Jim Raynor's dog tag loaded with the original StarCraft and the StarCraft: Brood War expansion
The behind-the-scenes DVD
A 14-track soundtrack CD.
Special Battle.net downloadable content such as character portraits, or unit customization details.
And an in-game World of Warcraft pet Thor.
While I would be interested in the special bnet downloads, I don't wanna pay an extra 40 bucks for it. That's money that goes to Diablo 3. =P
