Sorry for not getting back on this earlier! At this point, we’ve figured out the core features for Remark.as – mostly revolving around protocols we want to support which will let everyone start commenting. So we plan to start development in the first quarter of next year! (See our roadmap.)
As with other brand new tools like Snap.as, at launch, we’ll start by including Remark.as with your Write.as Pro subscription. And when we have something ready for you to try out, we’ll let you know on this thread and Twitter / Mastodon.