This is a good move, especially considering increase in AMD64 workstation from Sun.
From the official blog:
The fact that Flash Player 9 Unix support is presently limited to Linux/x86 has been the source of some consternation to the users of some non-Linux/non-x86 Unix systems. You may be interested to learn that Unix platform support has recently been expanded. There are now beta versions of Flash Player 9 available from Adobe Labs
Download Adobe Flash player for Sun Solaris