I know about the new fonts, I managed to test some recent nightlies with the new eye-candy, while having a bootable card and a booting camera.
I'm just saying that when you need to make the camera boot from the card, you need a .fir (which I've had for quite a while) . After the bootflag is enabled, you get a yellow-text screen (as opposed to the green-text success screen) saying the "bootflag is enabled", but "FONTS.DAT was missing, please copy all files (a few MB)", however, the camera refuses to load ML after restart.
My first (and so far only) solution was to copy the FONTS.DAT from an older nightly.