I've asked exactly same questions before.
But it looks like, unless anyone tries, I mean, try today(after series of system software update). I still can't believe the same CPU+chipset have a different capability.
It make no sense today for apple not allow 2.4G uMBP to support 8G RAM that even 13.3 MBP can support 8G RAM.
Yes and no. The older 2.4 mb cant but any recently manufactured will. I would imagine they made the change during the screen change as well.
Ya, I know 🙁
I'm also depressed right now that my Mac is for sale at Apple refurb for only $1349. 🙁
I thought it was still worth more than that.