See the last post in this thread for updated information.
Old information:
The short answer is: unknown.
And now, the long answer to the ever recurring question:
TSoG will be released whenever it's ready. ;)
There was an old deadline (autumn 2009), that has past. Since then, Craig Stern (the game creator) hasn't mentioned a new date, so I assume that there isn't one.
From the beginning of TSoG (previously called TRPG3) the project grew in complexity. New graphics appeared, voice acting is being recorded, we are now able to select characters in battle by our desired order, to mention a few new features.
On top of that, there are new missions and side-quests that aren't done yet (around 10 more missions were once referred), expansion of the locations to explore, new team mates (I think 2 or at 3 are already planned) and new dialogue.
So it will take a while until everything is in place and debugged (perhaps 1 year, who knows).
Adapted from my answer at Ask the developer a question! (http://sinisterdesign.net/forum/index.php?topic=31.msg15533#msg15533).
Craig's best guess (http://sinisterdesign.net/forum/index.php?topic=31.msg17816#msg17816): Telepath RPG: Servants of God release and purchasable game may be available Spring or Summer 2011
I'm now shooting for a winter 2011 release.
All right everyone, I've finally announced (http://sinisterdesign.net/?p=1278) a firm date for release: February 14, 2012.