Sun has been developing a high-end SPARC processor with the codename Rock. One of Sun's top engineers Marc Tremblay, delivered a paper at the ISSCC 2008 conference where he confirmed that Rock based systems would ship in the "second half of 2009".
A brief technical summary of Marc Tremblay's ISSCC presentation is available on ars technica under the title, "Sun: Can you smell what the Rock is cookin'?". ... 16 cores (32 threads) ... 2.3GHz ... 250W ... scout threads ... speculative execution ...
"A Third-Generation 65nm 16-Core 32-Thread Plus 32-Scout-Thread CMT SPARC Processor "
Marc Tremblay, Shailender Chaudhry