I've deployed Bitten with the latest Trac 1.0.6. There do not seem to be any problems. The Trac 1.0.x API is stable, so you are unlikely to see any problems with upgrading a 1.0.x release.
On the other hand, Bitten uses the deprecated pre-Trac-1.0 API that has been removed for the upcoming Trac 1.2 release. Bitten will not work with Trac 1.2 unless it is modified to use the new Trac database API.
- Ryan