A bit more from the official site and not secondhand news stories:
I'm pretty neutral about GFWL since I've never had problems with it, but I hear it can be a pain if it acts up.
- New Bosses - Including Artorias of Abyss, Chimera of Tomb, and more
- PVP Online Matchmaking System - Quick matching for co-op or PVP
- New Areas – Including Oolacile Tomb, Old Ruins and more
- New Enemies – Including Abyss Guard, Chained Prisoner and more
- New NPCs – Including Hawkeye Gough and more
- New Weapons and Armor – Equip some from the new bosses, enemies, and NPCs
More details to be revealed...