I've been paying partial attention to the following thread:
http://marc.info/?l=linux-hotplug&m=131352330625733&w=2

It's an interesting discussion.  I realize that
moving /proc/device-tree to /sys would probably violate
sysrq-rules.txt, but it would be nice to have a common way to
represent things like cpu type, board id, etc in /sys that is populated
from the DT.  I haven't seen that discussed here yet, has anyone
considered it?