The next big decision, in fact, is how to merge the 2D and 3D versions, Shuttleworth said, and it's a tough one that will require developers to redo some work.

Quality, however, is continuously improving thanks to the fact that there's now significant QA support for the interface, he added.

"It seems people who were even very skeptical about Unity are willing to give it another shot," Shuttleworth said. "I think the design vision is becoming clearer, and the team worked incredibly hard to address bugs and shortcomings."

3. Wayland Is on the Way

The new announced in late 2010 "will be exactly two years more mature for the next LTS," Shuttleworth said.