The folks at iFixit have done it again -- they've disassembled the new Retina display 15-inch MacBook Pro, revealing a machine that's beautifully crafted but also quite hard to repair or upgrade on your own.
The latest and greatest MacBook Pro doesn't hide any spectacular surprises as far as components go, but it does have many unpleasant ones for the avid home repairer.
Among other issues, anyone who tries to disassemble this machine won't like the proprietary pentalobe screws and the battery being glued (rather than screwed) into the case.
Furthermore, the display assembly is fused, without a protective glass. iFixit claims that if "anything ever fails inside the display, you will need to replace the entire extremely expensive assembly."
As far as upgrading the machine's RAM or changing its SSD, right now you can forget about it. The RAM is soldered to the logic board, and the SSD is proprietary and not upgradeable at this time, though this will likely change in the future.