I thought about a recent device type (tablet/mobile) mixing with openbsd for some time. My final thought was: openbsd will need some further dev work in this direction, but this is what devs do. Problems -> small Recent device type hardware has to be built and documented with some direction towards openess (bootloader,firmware,driver,etc). Problems -> huge Some work can be done on the openbsd side,but without a big change by the manufactors (they wont) there is no hope.
Here and there small companies come up with an open hardware approach ( openmoko) but the plattforms commonly do not survive.