Given Titleist is now seeding the 910s on Tour and they seeded the 909s in approximately May of 2008 and they were released in the fall of 2008 (~November) - I would assume there's a 6-8month window before they will be released.  So that would put it around December 2010 to early February 2010.

Honestly, I am assuming Titleist in the grand tradition of companies that build great things will release it "when it's finished."  Which is to say, it passes the inanely specific requirements of the top golfers in the world, followed by what I assume to be top amateurs and club professionals on down to the rest of us who lack a plus in front of our handicaps.

With all that said, I am simply extrapolating data form the past, which means I am absolutely guessing.

Aaron