There were lots of reasons why Corral failed, including poor choices of technology (MontageJS, p9fs), unfortunate engineering decisions (tons of unmaintainable wheel-reinvention, tons of backward-compatibility breakage), and poor planning (eg. documentation and localization ignored from the beginning, constant design changes). Jordan (departed CTO) would seem to have fallen on his sword and left, and the remaining executives (including returning CTO [and founder] Matt Olander) made the ruthless but understandable decision to cut their losses. They're re-focusing on the existing stable project with the intention of bringing in the the coolest features of Corral incrementally rather than all at once. Kris Moore has a solid record with PC-BSD/TrueOS and has been managing FreeNAS 9.x for some time. Only time will tell if FreeNAS 11 will live up to what 10 could have been.
The growth refers to the enterprise version of the current (9.x) product line, which is legitimately growing. It's just that 2+ years of engineering effort on the successor was thrown out two weeks after that PR.