I think I agree rushing in a kernel update might not be the best thing and giving it full 10+ days of testing in unstable is a good idea
Please do upload into unstable now, but no need to hurry with pushing into testing.It might be better to wait for final 10.1 and ask release team in one round for all packages.
We probably even want to follow releng/10.1 after 10.1 is final but that's a question people more familiar with upstream procedures than me (looking at steven and robert for example) should decide.
The releng/X after X is final usually contain only SECURITY ADVISORIES and ERRATA NOTICES. Petr