The new trend for Android phones: custom built UI's. The HTC Hero has the Sense UI built on top of Android, the Sony XPERIA 'Rachael' has a drool-worthy interface, and now Motorola will have 'Blur'. According to BGR:

It will combine all personal contacts and social networking sites into a clean and easy to use interface...The skin/OS is named “Blur” by Motorola and will be heavily web-connected. All Android devices will be able to upgrade different sections of the OS and interface all over the air.

That blurb on 'Blur' doesn't do much in the specifics department but we can obviously expect heavy emphasis on social networking sites (facebook, twitter) and maybe even some webOS-like features. Either way, we're very, very excited to see what Motorola can cook up with Android--HTC Sense and the 'Rachael' UI are absolutely wonderful, hopefully Motorola's Blur can be the same.