The feed for new posts is not built in and I'm not sure how to generate it. I'll wait for the new version vbulletin 5, it's supposed to be a major update with native iOS and Android apps.
Sure. They are rolling out a lot of new features but I'll wait for the key addons to be developed (by third party programmers) such as the chatroom, newest posts, and the spam filters. We may upgrade at the end of this year or sometime next year.