Difference between NetWeaver 2004 and NetWeaver 2005?

Although SAP is mentioning it in several presentations, no specific information is (public) available on NetWeaver 2005.

We are looking for arguments to wait with our strategy to switch to NetWeaver 2005, but this means that we have to wait to the beginning of 2006 (at least then we expect it to be GA).

Can anybody tell me if there is information on NetWeaver 2005 available, and if so, where I can get it?

TIA,

Jacques Dokter