iFixit has just dismantled the new MacBook Pro with Retina Display. It uses the pentalobe screws (same as the iPhone, so you need a special screwdriver), the RAM is soldered to the Logic Board so there is no upgrade, and like in the iPad, the batteries are glued to the body. They also noticed that the screen assembly has no glass protecting it, so if something happens to it, it would have to be completely replaced. Also, iFixit gave it a rating of 1 out of 10 in repairability, making it the least repairable laptop they have seen so far.
In other words, just like with the iOS devices, Macs are becoming more and more hostile to users who want to make repairs or modifications. Apple is step by step creating computing appliances, and while this is exactly what most users want (including me, I don’t want to ever open and fix my computer), I think if you are the kind of person who loves tinkering with your devices, Apple is not for you.