OneCare is available now as download directly from Microsoft Connect.
I'm still not sure what the news in this release (2.5.2744.0) are. Nothing clearly visible that is new but hopefully under the hood. Windows Live OneCare Team Blog might come with news soon.
Will Komoku Anti-rootkit software be able to be included in the final version of 2.5?
PS. I just found the news that OneCare hit the VB100 100 percent mark.
The latest independent Virus Bulletin tests looked at 37 different Vista-based security programs to see which could manage to reach the level of threat detection required for 'VB100' Certification. Out of 37 tested, 17 failed the tests, including big name products from McAfee, Sophos, and Trend Micro.