Another paragliding company making movements in the tube kite market are the French company Aerodyne. They've already got a couple of successful ram-air kites in their range, and have just released the Waidup tube kite. There's not too much information currently available on it, but keep your eyes locked to the website to see the developments.
Aerodyne (Issue #14 - Mar /Apr '05)
Kitesurfing Test - Boards 2013
Airush The Slayer
Kitesurfing Test - Kites 2013
Ocean Rodeo Prodigy 7m
Kitesurfing travel directory
Switzerland: Simplon and Grimsel Pass