The Vista 5728 build became 'publically available' over the weekend here. µ
Vole says it decided to release Vista to the riff raff because it has a number of improvements and updates from RC1, but has not been put through the same internal testing process as RC1 and therefore may be unstable.
A spokesVole said that the release will be available for a limited time and and only by download in order to get broad distribution and testing in a variety of PC configurations. In other words, the deadline for release is fast approaching and Vole is a little concerned that some of its software might not work properly without mass testing.
The Vole server contains the 64-bit version although there is not a link on the main page.
Vole seems to have read some of our complaints about not being able to kill off the start-up music as there are instructions on how to disable it. µ