WOFF2 file extension and media type

Hello WG,

I've been contacted privately by a developer who asked me about two things - what would be the appropriate font file extension for WOFF2 and what is the media type to be used when the fonts in WOFF2 format are served.

We haven't yet discussed the file extension at all - the assumed file extension was .woff2 although I am not sure if having five-character-long file extension is okay in all circumstances. As an alternative, I suggest to consider .wof2 but this is merely a proposal - I'd rather have us to decide on this and announce it publicly as soon as possible - the folks are waiting and the guy who contacted me with these questions is not alone, I am sure.

As to the media type - we did discuss it in the past and while we all seem to agree that having the top-level 'font' type would be ideal - we are not there yet. Applying for the top-level type would be a huge undertaking and something that may not bring the results soon enough for developers who need it now. I am wondering if we should (at least in the near term) consider something similar to what we did for WOFF 1.0 and register a media type as part of the "application" sub-tree, e.g. "application/font-woff2" Comments?

Thank you,
Vlad