2 disc editions include: extended and deleted scenes plus commentary with Rob and Kristen, Stephenie & Wick - music videos - Jacob and Edward fast forwards.
**Edit**
Target - *Collector's Edition* $27.99- 2 disc w/6 photo cards **24.99
*Collector's Edition* Blu-ray - $34.99- 2 disc w/6 photo cards **$29.99
2 disc DVD - $22.99 **$19.99
2 disc Blu-ray $24.99
single disc DVD - $16.99 **$15.99
single disc Blu-ray - $24.99 **$19.99
Some of the prices have changed since I posted this originally.
**The "Exclusive" is a bracelet which can be purchased with the DVD for $5.99 or separately for $9.99. It is silver tone with a brown color wolf and crystal heart on a gold clasp. I admit that it's not likely to be anything significant for that cost, but it's symbolic. The best deal I found was the 2 disc from here
Best Buy - *Exclusive* (no details yet) DVD 2 disc - $26.99**$24.99
*Exclusive* (no details yet) Blu-ray 2 disc - $36.99**$28.99
2 disc - $29.99**17.99
2 disc Blu-ray - $34.99 **$26.99
single disc - $24.99 **$15.99
single disc Blu-ray - $29.99 **$19.99
Wal-Mart, Barnes & Noble and Borders all show to only have the 4 editions so far. Please post if you've found other information. The list price for all showing to be average $5-$15 higher on all editions, thought I'm not certain if that due to having an account/membership with the store, or a pre-order discount.
Walmart has also added an "Exclusive" to their site: They offer a combo pack with the Destination Forks: The Real World of Twilight.
Wal-Mart - 2 disc - $21.46**17.96
2 disc Blu-ray - $26.46 **Contains Blu-ray & standard DVD
single disc - $16.96**$15.96
single disc Blu-ray - $22.96 **$19.96
**2 disc Eclipse/Destination Forks - $24.96
Barnes & Noble - 2 disc - $21.44
2 disc Blu-ray - $26.64
single disc - $18.84
single disc Blu-ray - $22.74
Borders - 2 disc - $27.99
2 disc Blu-ray - $29.99
single disc - $19.99
single disc Blu-ray - $22.99
Just thought there needed to be some direction for those of us who are looking to get a jump on shopping! Enjoy!

Has anyone else seen what the special editions are including other than what I have at Target?