It seems that Microsoft has already started working on SP3 for Windows Vista. Recently SP2 RTM for Vista was released and now its turn of SP3.
A new hotfix "KB957414" is available which is set to release for Vista SP3.

This hotfix fixes an issue where Event Viewer crashes when you open a large event log file and sort log entries by one column on a Windows Vista-based or Windows Server 2008-based computer.
To better understand the issue, consider following scenario:
- You open a saved event log file in Event Viewer on a computer that runs Windows Vista or Windows Server 2008.
- The log file size is more than 2 megabytes.
- You sort log entries by clicking the header of a column.
In this scenario, an exception occurs and Event Viewer crashes. This problem is more likely to occur when you click a column header multiple times in a quick succession.
Its quite interesting to see that Microsoft is going to release another service pack for Vista even though Windows 7 is almost ready to release.
This article was posted by VG in following section: Windows Vista.
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Shahnawaz
Is SP3 going to provide any new feature? or it will be just released to make vista even more reliable.
VG
^^ Nothing can be said atm.
blackzero85
I don't think it's going to add any real features. You can compare it with XP SP3, which lacks any noticeable improvements except making XP more reliable and smoother. I think Microsoft's strong interest now are to provide the best support for Seven, and drop Vista eventually. Vista isn't going to last long, unlike XP since it doesn't give revenue like XP had for Microsoft....
Dude
Released in 2011 (But SU 8 Improved in Vista SP3)
IE 9 Incompatible :(