Dawg: I think you are incorrect. Unused vacation in the previous contract was handled the same way. They will buy back unused vacation hours up to 40% of your total vacation hours at the end of the year. So if you had excess hours in your bank at the end of the year (more than 40%) you would lose those hours.
The only changes to section 7 were to rename the conflict windows and the terminology of VIPs requests to match the new bid processing windows.