I'll keep this short. You said:

"The whole Gen1/Gen2 is getting to be quite a mess, and it is my personal take that PCI-SIG royally screwed up on this one. Bandwidth should have been marked much simpler, e.g. double bandwidth of PCIe 1.1 (Gen1) x16 should have been marked as PCIe x32 instead of PCIe Gen2 x16 - but hey, this industry lives to confuse people."

This might help you understand a bit about PCIe http://computer.howstuffworks.com/pci-express1.htm and just so you don't get more confused I don't think x12 is real but there probably wasn't enough space to fit x16 on the picture.

[It is a long time since I read such a boring comment on an article, it's almost like I'm still working for the Rogister. Ed.]