Saw your letter, but really it's not a good idea to send personal letters to team because I we my best to answer them also but
- If the letters contains usage questions - I just points the guys to forum in order answers to be came public
- In general letters could be postponed to be answered later if has no time and then them have a chance to be lost as support by mail is no priority at all because of numerous letters
About the question - other RF components will be moved according to http://community.jboss.org/wiki/RichFaces40ALPHA2ReleasePlan (prioritized list of components linked at this page)
And A2 will contains only full set of a4j:tags and iteration components.
Then the other rich:components will be planned to Beta's.
We do our best updating 4.x planning pages at wiki to include some possible dates. So please review them.
So if your project started right now - it seems like it's early to try it out. But if you just prototyping you could include the components as far as them released in future.