These updates are not on Steemit or through communities, it is a @steempeak feature. Not sure if other UIs will integrate similar, but I am guessing it will evolve.
Yes, resteem works and it will go into your blog roll like normal. Weird thing is, if you post in a community and want it in your own blog roll, you have to resteem yourself. The reason is that sometimes you might not want every post to be in your roll, for example if there was a helpdesk community where people asked questions, it could be that those questions were automatic "decline payout" and you would only want them to appear there.