OpenSPARC T2 version 1.1 was just released. New Features in release 1.1 include:

• Included Network Interface Unit (NIU) source code in the distribution.
• OpenSPARC T2 System-on-chip (SoC) micro-architecture document has a new chapter on NIU. The document now is also divided in two volumes to reduce the size of the each book.
• Verification and synthesis are now supported on x64 hardware platform running on GNU kernel Linux 2.6 and above
• Simulation environment now also supports Cadence NC-Verilog simulator. It is still required to have Synopsys Vera for the testbench components written in Vera language.
• SPARC Architecture Model (SAM) now supports Solaris operating system running on x64 hardware platform
• SAM has new user interface for better usability and more functionality
• Fix Open Boot PROM (OBP) build script for niagara1-hw and niagara2-hw platforms

See here for more details

Released on May 10, was version 1.6 of OpenSPARC T1. New Features in the release 1.6 are:

• T1 core supports single- and four-thread options on FPGAs
  
• Reference designs boot OpenSolaris on single- or four-thread mode
  
• Xilinx Virtex-5 technology support
  
• Networking (ftp, telnet) support