RealSoonNow
If your craving is bad enough, you might seriously consider downloading Celestia v1.2.5pre4 (a full binary distribution) plus the pre6 Celestia.exe update. Personally, I consider most of the remaining bugs to be superficial and not functional problems, although I know Chris fully intends to stomp out as many has he can before the official release.
They're available in
http://www.shatters.net/celestia/files/
I'm rashly assuming you're running under Windows. If you're using it under Linux, quite a bit more effort is needed to download the source and build the binaries.