The new version of the software Sun Ray client hasn't yet been released, but some details on its features have been leaking out. Although the original source is no longer available, search engine cached pages have preserved the content.
For those that just want it short and sweet, here is what's notable:
- Support for Mac OS X
- Audio recording, in so far as it was already supported on a hardware Sun Ray
- IPv6 support
- Smart card support
- Serial port or USB-to-serial port passthrough (Windows only)
- Multiple connection profiles