I only know about Salomon demos, but just barely heavier than the normals ones. The toe is the same, but it sits on a sliding plastic track. The heel is just a long track with a lever instead of the metal tab.
If anybody wants demo bindings. Send me a pair of 912's and I'll mount them on demo...
2007 FKS bindings are already available in Freeride and Race versions. The PX20 (or Rossi equivalent) was used on the WC last season. Freeride team might get it, but FKS bindings are available regardless.