Sun has announced new T6340 blade. I've been playing and deploying systems with UltraSparcT2+ for several months now and I can say it's a great platform for consolidation or migration from older HW. We've migrated from older v480 and v440 to a cluster of T5220 servers utilizing branded zones (Solaris 8 and Solaris 9 zones). T6340 is basically a T5240 in a blade form. All I can say is: it just works. The performance is excellent.
What a lot of people do not realize is that one can easily consolidate several e4500s or e6500 or any other old SPARC servers on Niagara based servers. Not only the performance will be better but you will save on support and operational costs. Additionally you can use branded zones to migrate your Solaris 8 or Solaris 9 environment into a zone on Solaris 10 if you can't justify deploying your applications directly on Solaris 10. You can always create another, Solaris 10, zone later on and migrate your application between zones within the same hardware.