Well, it seems to have answered your question about groups :-)

There is currently no public feed, but Evan has given us https://pump2rss.com (although this doesn't seem to work for me).

My understanding (and I'm not a techie, just an average user), is that this new version of Identi.ca is still very much in active development and so, yes, there are lots of things that currently don't work or that are absent that we had in the old Identi.ca, but that probably will work or be added in the future.

If you're wondering, well, why switch to something that isn't 'ready', again, my understanding, is that it was this or nothing. So for that, I am thankful (especially as most of my online friends that I have the best fun with are still here).

If you haven't already checked one out, I recommend that you look at using a client rather than the web interface as you will have a much better experience using the new Identi.ca that way.