The FAA has finally formalized extensions for Part 61 and others...
Not to my knowledge. AFAIK, and as far as AOPA has announced, the only step the FAA has taken is to forego enforcement of medical expiration dates through June 30. Nothing on 61.56 flight reviews, annual 61.58 PIC checks, 61.57 recent experience, etc. Have you seen something to the contrary? If so, please share it. Here's where you can get the latest official information from the FAA on this subject:
I'm sure you're right... I was skimming the news for Part 107, saw "extension", and turned the medical extensions into something bigger.
Again, there is no "extension" of the medical certificate. The FAA said only they won't enforce that rule for flights made between April 1 and June 30 as long as your medical was valid on March 31. And, as the FAA and AOPA both said, there may be serious financial risks if your insurance policy requires a current medical.
Under the extraordinary circumstances of the COVID-19 outbreak, eligible remote pilots whowould normally establish recency of knowledge in accordance with § 107.65(a) or (b) may complete online training as an alternative if required to establish recency between April 2020 and June 2020. The remote pilot may complete the FAA-developed initial or recurrent online training courses  at www.faasafety.gov one time to establish knowledge recency for six calendar months.