They're not building an extender like the xtender, but designing a new case that will fit the extra HDD. Impression I get is that the case is still under development, if you want capacity for a larger fan, now it the time to have your say but why do you want extra fans? With proper airflow and ventilation you should be fine with the stock fan (or upgrade to a panaflow fan with higher CFM air displacement, and lower db).
