I am not really sure I was thinking the same thing I would contact the FAA and ask about that!
AOPA has already done that and the FAA is preparing a response. AOPA's DC team knows whom to contact and how to get what we need. Check https://www.aopa.org/news-and-media/all-news/2020/march/16/latest-news-coronavirus-impact-on-ga for the latest information.
Has the FAA permitted extensions for annuals?
Not so far. Just pilot medical certificates.