Just go a page back and read the Seam 3 pages. If you look at the development status, you will see that Seam 3 is basically still on the drawing board and it will some time to be at the level you want to use at your corporate level.
The differences between Seam 2 and Seam 3 are basically architectural and important for the developers. Conceptually thinking they're the same, although the modularity of Seam 3 is one of its main advantages. I am still hesitating to jump in the deep right now and - although I am reading manuals etc- - I am not actively using Seam 3, but I am sticking to Seam 2.
Yes use Seam 2 is a great Tool i have used it with almost 5 projects and works very well it improves so much the JEE5 and i let you this link may be it coul interest you ....KUBEKIT.... this is a set of utilities or tools that helpus to all seam programmers :) and off course the idea is to migrate it to Seam 3