Some notes:

Three variables, 1. time, 2. functionality 3. quality. When you fix two, 
the third must be fluid. Choose the first of these to fix. I would 
choose quality, aka and to this end testing is important.
 
Assuming the testing story is worked out. Then I would hope for 2 
development streams.

1. Incremental: new feature, new tests, all tests pass -> release 
frequently. (no time constraints) no release schedule.
2. Core - Discrete Managed change. Again, new feature implement, 
integrate, and migrate/merge back into main stream.

am I being too naive?

Keith



		
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