I think Eyetech announced last spring that they have made an agreement with Apple for the use of Apple MegArray connector. (and I understand "they" = MAI and that all could be a lie)
But anyway, it is possible in theory. And if the bus protocoll is different, it is anyway pretty trivial for the Mac CPU accelerator manufacturer to tweak the card for A1 or TeronPX.
Like I said ALREADY the connector doesn't mean squat. I mean hell, the Pismo uses the came connector and it has the northbridge chip on the daughtercard.
It isn't trivial to change the "bus protocol" especially considering:
a) Sonnet had a dual G4 upgrade soon after the Sawtooth was released. Many many YEARS later were other CPU modules made available.
b) The A1 market is basically zero. If it took YEARS of New World Mac sales before there was a market for more than one CPU module upgrade how many decades of AmigaOne sales would it take?
Wake up people, really |-\