I could be mistaken, but weren't the later phases of the beta about getting multiple worlds up with many users and keeping them up for stability, in addition to testing things such as the peer to peer based client distribution? I would think that feedback on things such as leves and leveling are likely set in stone and discarded, but feedback concerning client installation and updates is probably more what they're looking for. Also, since beta keys are being distributed to things like fan-sites and other things (like FilePlanet), it seems like they are entering a marketing phase now which would run alongside the stress tests. How many people in an area, how many people on a world, etc.
WoW Blackhand-US-Date of Retirement: 9/21/2010... /Sigh
Devari - 90 Rogue 85 DK Druid/Mage/Warrior 70+
FFXI - Shiva "Retired.... Or not? One more try, honest."
Desmar - 65 Sam 36 Mnk 18 Thf 12 War
FFXIV - Devari Garamond - Sargatanas 50 Paladin / Culinarian / Weaver / Armorer
Beta - Devaria Ariadne - Ultros - Pugilist