Quick author's Notes on TMNT: Deliverance...
This was written and completed in October of 2005 by Andrew Modeen and Jeff Oughton, with help from Sharon Lee.
It's actually the equel to "Teenage Mutant Ninja Turtles : Transcension," which was completed in 2000. A quick search here of "transcension" should turn it up... I suggest you give it a read.
There is a third story in the works... "Ascension," which will bring the trilogy to a close.