On motorcycle.com:
http://www.motorcycle-usa.com/762/12963/Motorcycle-Article/TTXGP-Season-Opener-at-Infineon-Raceway.aspxThey interview Brian Wismann and Steve Atlas.
What’s the main difference fans will notice this year from Brammo in terms of the technology?
Brian Wiseman [sic] 
: For 2012, Brammo has focused on upgrading the powertrain of the bike to a new, more powerful Parker-Hannifin motor along with a physically smaller and lighter motor controller/inverter. The chassis and battery technology remain largely unchanged from last season as we were quite happy with their performance and credit the bike’s handling and durability with helping us bring home our first championship in 2011.
emphasis added 
