Campy is already coming with the new 2005 wheelsets (Eurus and neutron). First sets should arrive soon (some de Rosa demos are already equipped with them).
Although no information is given free they should be slightly lighter (the hubs will be Carbon) and rims of Eurus will be in silver.
although Campy didn't announce anything the manual is already available on their wegsite.

http://www.campagnolo.com/pdf/EURUS_CH_PART2.pdf