The jasper is in almost all 360 arcades by now and is the most awsome chipset so far,but the next chipsets are already being talked about,this what they are said to be.

Opus:This is basically a 3rd gen falcon chipset and would primarily be to recycle rrod xenon chipsets giving them cooler more dependible guts,but it will have no hdmi

Valhalla:This wont be untill 2009 or 2010 but it will have a unified CPU and GPU(one awsome super chip),making the system have one cooling system and making it quiter and hopefully even more dependible than jasper

Opus was said to comeout in 2008 or 2009 so we will have to see,info from joystiq

er Opus was out ages ago ...

sorry i did not know opus was out already

Opus are just falcons without an hdmi output they retrofit inside old 360's.

Valhalla is just a rumor at this point. Of course a combined chip leads to savings and reliability, but it still feels it's too early. If I recall, it took Sony 7-8 years until they combined bot the EE and the GS into a single chip.