You want Wireless N in a Mini? Get a USB-N wireless adapter!
Since the Mac Mini shares components with the Macbook line, and Macbook was recently upgraded to SR, new GPU, etc., expect to see these specs in an "upgraded" mini around summer time.
If you need wireless N in your mini, it's as simple as getting a Wireless N USB adapter.
Apple has always "handicapped" the hardware of the mini, so anyone w/o a monitor comparing it to an iMac based on specs would go "oh, well, might as well just get the iMac for a little more with monitor included).
Apple has always also limited hardware options, because they (Apple) have to write all the drivers to ensure maximum compatability etc. This mindset/logic will also prevent a user-upgradeable tower, because all their resources are tied up with the Mac Pro line, as far as that goes (if you need upgradeability, get the Mac Pro, etc.).
Don't see Apple adding a user-upgradeable mid-tower ever. Nor do I see them retiring the mini completely. ymwv. 😀