Maybe not all "features" but certainly changed from 7SP1:
1) Shows "glowing" Windows logo on 1024x600 netbooks instead of the annoying Vista style green progress bar.
2) Imagex /apply install still working. Only a single image in the WIM -- Enterprise...
3) Does not ask for an owner name during initial setup. Goes from country, time/currency and keyboard to computer name wizard panels.
4) Initial username and password panels combined into one.
5) IE 9 installed by default.
6) Brightness control on battery icon popup.
7) Scheduled maintenance tasks now optional in action center.
8) "My Look" icon on taskbar to right of clock - switch to another user right from the icon...
9) New Homegroup sharing interface.
10) Centered Window Titles
11) Overall faster performance on Atom CPUs -- from about 25% to about 50% faster for tested tasks.
12) View chooser in status bar of Explorer windows
13) Explorer details pane moved to the right.
14) Showing favorites in Explorer navigation pane now optional.
15) Up one level button in Explorer windows next to back and forward and the address box.
16) Devices and Printers now in Accessories on the Start Menu too.
17) .NET Framework 4 preinstalled.
18) New Windows features dialog options:
Active Directory Lightweight Directory Services
Data Center Networking -- Link Layer Discovery Protocol Driver
Location Provider Driver
WMI SNMP Provider
19) Evidence of a Deskband Indicator Taskbar toolbar that refers to a touch keyboard.
20) An option hidden under Advanced Recovery Methods to Restore Windows to it's original condition without reinstalling -- AND you get to keep your data!
These are just my first 20 finds...
You read it here first
I'll write up a complete article on these things with screen shots if anyone is interested...