I think the system will be backwards compatible. The new transponder will work with the old decoders so you can use them when they are available.

Also, If you go the mylaps website and download the whitepaper it does say that the new decoder will be backward compatible with the old RC2 transponders.

At least I hope they will be. They do look cool though

http://www.mylaps.com/index.php/emea...c4_transponder