Please make sure to submit feedback on those through the in-product feedback tool. That's the best place to get feedback quickly to the Yammer product team, and it also means that your feedback is included beside peers. It makes a difference when feedback reports are created.
1. I think there is an All filter coming soon. 2. Probably best to provide additional detail on what you need from search via the in-product feedback tool. I'm assuming you are looking for the ability to search between dates, etc. Correct? 3. Interesting question. I think this may be because we are now using the standard profile card from the suite which doesn't have the Yammer specific-follow.
There will be some documentation arriving soon on features being worked on.
Best Response confirmed by
Sanjiv_Sharma (Occasional Contributor)