I have started reading the "Web Beans Sneak Peek". Months ago, the prospect of JSR 299 made me decide Seam is a good way to go. I haven't read though anywhere about a roadmap that spans to/after the release of the JSR.
What will Seam evolve into once the WebBeans spec is out? Is it going to be something like what we have seen with Hibernate/JPA?
To answer myself... Gavin states in a comment on his blog over here:
Probably, Seam will eventually be split into two layers:
1. the core component engine, which will evolve into the Web Beans RI
2. the framework layer which will provide all the built-in components, JSF components, etc.