I wonder if what they will offer is seamless (or at least reasonably good) conversion to and from a more portable and lightweight format (in the same way as they do for the Mobile Office products).

This was what Psion did a long while back, and it was very useful, but not everything worked perfectly (no tables for one thing iirc, which is a pita for a then Engineering student).

Anyway I think something like that would be reasonable and useful, certainly more so than needing to run OO on a device with all of its features, etc.