From my poking around, here's what you get as an upgrade over the R2H:
Pentium M 723 (1.0GHz ULV)
1280MB DDR2 (256MB onboard, 1024MB SODIMM)
80GB 4200rpm HDD
Vista Home Premium
All the other specs are identical - 7" 800x480 WVGA screen, two cameras, GPS, fingerprint reader.
That one snuck out under the radar - I hadn't even heard of it until now. It's finally worth buying.