(author here): GPG support for the web can be easily done with @okTurtles, and was part of the plan from the start. It's very easy to do that compared to the rest of the goals of @okTurtles.

One thing about that though, is that GPG-based communication suffers from all the problems described in the OTR docs (and the overview paper on the site, see sections on plausible deniability and PFS). But if you want it, again, it's very simple to transparently support GPG on the web (once the rest of the foundation is implemented), and I can definitely see how people would find that useful for forums, reddit, HN, etc.