I just spotted that SkyTraq has just announced their new S2525F8-BD-RTK OEM RTK Module which seems to a competitor to Reach.
Announcement:
SkyTraq Launches Miniature Low-Power RTK Receiver for UAS and Mobile Platform
Some preliminary technical info is here:
Technical PDF
The module should draw 300mA and I guess it will be smaller than Reach. It is simpler than Reach since it only can output precise coordinates in NMEA-0183 while Reach will thanks to its x86 CPU most likely allow some “user programming”.