The 5 string is the 108mm long version (magnet is 77.5mm wide) and the 6 string is 117mm with a longer 87.6mm magnet, info I got from Alex at EMG. I suspect, as I didn't ask, that these are actually P2 and P4 sizes (108/117x32mm).
This means that they won't fit in my Ibanez SR or Cort A6 6 strings with the 108x34mm MK1 pickups without routing. The later BH2s in my BTB846 are the same size. Looks like I need to get out the router for at least the SR so that'll get DCXs or maybe TWXs.
When I email back, I'll also ask if this new PU internal structure will also be available in the 35/40/45 sizes too - it would make no commercial sense if they weren't, assuming they fit.