It came from the Steemitblog at the end of December. Here's the link: https://steemit.com/steem/@steemitblog/hardfork-20-velocity-development-update. That's the last one I've seen from them regarding a HF 20 update, but that doesn't mean someone else like a witness hasn't provided some information since. There's plenty of other things of interest on the steemitblog too.