The only change from that list which actually requires a HF is the minimum / uniform ringsize. The other 2 can be rolled out at any time. AFAIK, the current list for the upcoming hard fork is:

Only RCT transactions will be allowed Minimum / uniform ringsize Range proof size reduction

and the exact date hasn't been decided yet.

The discussion on 2. can be found here.

For 3., I've not yet seen any code or Github issue so hard to tell the progress of this. Luigi1111 (one of "core team") is working on it.

The best way to be on top of things is to monitor the dev meetings which get published on a few places, or just stalk various community channels. There's not something like a "live HF list", but anyone could volounteer to keep track. All it takes is to have a chat with some key contributors, make a list and add a page to the official site repo.

In any case, a version tag will be made on Github prior to HF, and that will happen some ample time before the HF date where everyone will be able to easily see what gets changed.