If you are a current OneCare subscriber (or have an active free trial), expect to be upgraded to version 1.5 in the next few days, according to the OneCare blog. Windows Live OneCare will be officially released on January 30, to coincide with the Vista launch, as 1.5 supports Vista, but current subscribers will be seeing it sooner.
The OneCare blog makes the Jan 30 date official, and lists the countries where OneCare will be available:
We've been talking about our next major release for a long time, and now we are finally making it official. Today we announced that Windows Live OneCare v1.5 will be rolling out to customers in Australia, Austria, Belgium, Canada, France, Germany, Ireland, Italy, Japan, Mexico, the Netherlands, New Zealand, Singapore, Spain, Switzerland, the United Kingdom and the United States on January 30th.
In addition, current beta testers (who will have to uninstall the beta and install the final version) can expect a special offer, a significant discount for a year's subscription as a thank you for beta testing. If you are a beta tester, expect an email within the next few days.