IIRC, they've said that POP3 support wasn't available during the preview, but it is something that they would support on release. I have a hard time believing that they would just completely dump support for mail servers using POP3, which I suspect is still more widely used than IMAP4.

As to the issue with SkyDrive and multiple accounts, that's something else that I have to believe that they're going to address. It just may not be at the top of the list.