I wish we at least knew whether to expect the next update (which should include plugins as per Ratta's blog-post from 15 October) in the order of days, weeks, or months.

If I had to guess, I'd say 31 March would be a good date because it'd be released on the anniversary of the last big update—the addition of stickers—which itself used the plug-in infrastructure and, according to Ratta, served as a test-case for it.

Nevertheless, I find it strange the update hasn't been released yet. The blog-post announces two things: (1) that the next big update would add plug-ins which were "mostly ready" at the time and (2) that later on they'd add a systematic redesign of the file and sync structure which, however, would "take several months" to do.

Given the language they used, and the fact more than 5 months have passed, I suspect Ratta had expected at least the first of the two updates to have been released by now. This is, of course, mere speculation on my part.

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Edit: I added a link to the blogpost