This is pure speculation that appeared when Pacific Cycles announced its anniversary P40 Birdy.
There was some confusion about the future of the P40, seems that at a certain point Pacific Cycles hoped it could become a normal commercial type of Birdy but that this was blocked by Riese & Müller who is the owner of the Birdy IP ? It seems that the Birdy IP ownership of Riese & Müller will end in 2024 with as consequence that after that date, Pacific Cycles will be allowed to develop and commercialize its own Birdy ?
Anyway, the P40 has a different mainframe but it folds just like the Birdy 3 and its folded size should be the same or very close ?
I write "should" because I don't know if the P40, which uses the Birdy 3 fork and rear swing arm, has the same geometry as the Birdy 3 ?
I have a Pacific Cycles gen3 Titanium Birdy and discovered that its geometry is slightly different than the one of the Birdy 3 and it folds slightly smaller too.