There's been a few. Obviously details are vague, but it sounds like (according to their more recent patreon announcement) that Matt is communicative in some manner. Speculation is probably a stroke, as we saw with Fetterman recovery can take quite a while in that case.
The good news is Amber (Matt's wife) gave birth, both she and baby are doing well.
What happened is he fell into a big vat of chemicals in a 1930s factory, and then when he came out he demanded a mirror from the doctor, and then he just started laughing