I am facing the same doubt.
This is still beta so you should expect changes. The current CVS Head should be really close to what will be released *but* could have some few changes.
IMO the major updates are related to the EJB3 PFD changes, it shouldn't change again anytime soon.
If you work with the jBPM integration in Seam, it changed quite a lot, so i would not suggest doing more development with jBPM based on Seam Beta 1.
I understand the pain, we feel it too when we have to update all our examples, but we have to do it while we can (that's before 1.0 final)
What is in CVS now is very, very, very close to what well be released as beta 2. And note that most of what is in beta2 is now very stable and I don't expect big changes to the currently existing functionality in Seam 1.0.