There are no replacements for these in Seam 3. The listener and the filter were for bootstrapping Seam 2. This is all part of CDI now, and any CDI implementation will do it's own bootstrapping either with it's own listeners / filters or via integration with the server.
The documentStoreServlet is also does not have a replacement. Currently, you'd need to create your own servlet to recreate the functionality. I'm also in the works of doing a migration of Dan Allen's Open18 application from Seam in Action. You can find more info at https://github.com/seam/migration and also the wiki for that repositiory. I welcome any help / edits / thoughts from the community!
The first thing, which we did a very poor job of communicating: Seam 3 is not a drop in replacement, or any sort of replacement for that matter, for Seam 2. If you're on Seam 2 and like what's there, use Seam 2.3. I'll respond to the questions in the other threads in those threads.