Recently some references to a T4 server have showed up, it looks like it's Intel based and that it will at least be used as head in the 7000 series of storage appliance. It world be a bit confusing if this will be the final name for the server, since there are already a SPARC(R) chip with the name T2 with a T3 successor in the works. But this would indeed be to carrying on a Sun tradition, Sun had X64 workstations introduced in the Ultra-line with was based on SPARC(R) Ultra processors. We all love marketing don't we?
There are currently not much more information available, we have to wait and see both on what kind of server it is and what the final name will be.
Talks I have given
5 months ago