We've delivered the code to Steemit (PR is here: https://github.com/steemit/steem/pull/3272).
Next step is the hardfork release, they're currently polling witnesses to see what if any other small changes will be included with the hardfork release.
Any frontend will be able to make a UI for the proposal system: I hope most will support it.
I can't say I understand what's going on in that picture above, I guess it's a small part of some larger conversation.