According to a news item found here:
Fudzilla - SP2 for Vista slated for release in April
A release candidiate for SP2 could be seen in Febuary whilst the main release looks like being scheduled for April.
You may have seen a new utility floating around the web recently called 'GPU-Z'. It's very much like it's name-sake 'CPU-Z' although as you can guess GPU-Z gives the user information about the graphics chip and not the CPU itself.. If you want a copy go here:
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Check out this link for a small article numbering Vista's vulnerabilities in the first year compared to XP. Vista of course comes out on top with having around half of the vulnerabilities that XP had.
Fudzilla - Vista more secure than XP