I dual boot AND run several virtual machines. I prefer running some things natively for the comparative performance advantages you get.
I don’t see this new boot loader getting much traction. Even if it does, it will be reverse engineered just like other closed Microsoft specifications (ntfs read/write modules as an example come to mind). This is what the open source community does very well — frustrate the makers of closed specifications. There is, however, some lag time in development.
I run boot camp and Windows XP on my mac so I can access my work computer with a usb device. I eventually will end up switching to another version of windows for that capability, but it looks like that will stop with Win8.