Dell on their USA "Home" website, they offer a choice of Windows 7 and 8. When customizing a new build, one has to be sure to look for the Windows 7 and Windows 8 choices.
If not, your build will default to Windows 8.
Windows 7 won't be dead for a very long time.
It's just that retailers are going to push Windows 8,
as it's touted to be the next big thing.