Actually, the iPod version is still *far* from finished too. But the Sansa one should catch up with the iPod one, and then they'll both finish at about the same time (due to similarities in several aspects of the hardware, specifically the CPU itself).
There has never been a "release" version for the iPod yet. It hasn't "come out". Right now the most major holdup on the Sansa is audio support. The hardware has no documentation that we can legally use, so it's difficult to implement. Until a *legal* solution to this issue is found, there's very little that can properly be done in that area. And of course, an MP3 player without sound isn't much of an MP3 player, is it?