Dungeons and Dragons 4th Edition
Just got my pre-order of the DMG today in the mail and will be looking through it this weekend.
Also, a little birdy on the intrawebs has perhaps said something about there being (already) high-quality scans of the DMG, PHB, and Monster Manual ready for
legal-only-if-you-already-own-the-books downloads.
I will be going through the rules, as I'm sure anyone else with a copy handy will be. Make sure you post your reviews here so we can tell if this is a winner, or if 3.5 will remain king.