I would bank on there being a SP2 for Windows 7. Lots of people who are just getting around to upgrading from XP or Vista to Windows 7, aren't going to be looking forward to changing OS's for quite some time.
To answer the original posters question, features that I would like to see built into Windows 7 include
1). ability to mount an ISO file without having to install 3rd party tools
2). virtual desktop support