The 2.1 patch is scheduled to go live on North American and European servers on November 17, 2010. The main point of this patch is the increase of a drop rate of gear (weapons, armor and accessories), skill manuals, stigma stones, fluxes and other items.
Aion team has also announced a new feature the experimental lab. The first experiment was the comparison between the loot drops in Aion 2.1 and Aion 2.0.
The Aion team will be bringing the servers down at 3:30 a.m. PST, November 17, 2010. The maintenance is estimated to take no longer than 3 hours.
You can find details about this update in the official patch notes.