This was good to see today.
FYI, The KB on 3TB drives was updated today:
Does Drobo support drives larger than 2TB?
New larger capacity drives (e.g. 2.5TB, 3TB) are now available for purchase in 3.5in SATA models. Drobo supports the use of these high-capacity drives in Drobo systems to allow users to continue to expand their Drobo storage.
Users of Drobo products can download and apply a free firmware update for their Drobo system and make use of drives >2TB. Availability is based on the following schedule:
December 21, 2010 = Drobo S
January 2011 = Drobo FS, DroboPro FS
February 2011 = Drobo, DroboPro
March 2011 = DroboElite