From Computer Q & A
Windows 7 (RC) Release Candidate is scheduled to come out today for TechNet partners and on May 5th for a broader public release. This release indicates that Microsoft is ready for third party software & hardware developers to get their software and drivers prepared for the new operating system (OS) release. No final release date as of yet.
I’m going to turn your question around and ask, “Why are some people dissatisfied with Windows Vista?”