There are quite a few videos on YouTube and elsewhere on the web by now about disassembling the new PS3 UltraSlim. The following one doesn’t go very far in terms of disassembly but it’s very practical: How to change the Hard Disk Drive in a PS3 ’4K series’ console.
It appears to be even easier than on a ‘fat’ PlayStation 3.
In the meantime, we’re still waiting for a confirmation whether the (solid state) memory in the new 12GB model can be replaced in the same easy way, i.e. whether it uses the same (SATA) interface.