The most positive features are around the new Metro apps included with Windows 8 and improvements to the ‘preview apps’ that shipped with the Consumer Preview late February. Highlights include,

User Interface
The Metro mode now has increased personalization functions, and the desktop mode has some refinements for multi-monitor support and screen-corner UI. While not necessarily available in the Release Preview, Microsoft is working on indirect multi-touch support for the track-pad that would ship with Windows 8 based hardware.

Applications
Microsoft has added several applications across a wide spectrum
Entertainment & Leisure - (Travel, News, Sports, and Xbox Gaming and Music apps),
Business / office Productivity Apps (Mail, Calendar, People, Messaging, Reader, and SkyDrive)
Daily Digital Media (Camera, Photos, Music, and Video) applications that debuted with the Consumer Preview.

It is really cool that Xbox Live app available on Windows 8, would, enable users to access media content on their Windows 8 notebooks, tablets, and Windows 8 phones as well.

Flash and IE 10 Browser Support
Microsoft, in partnership with Adobe, has built some native flash support into both the Metro and desktop versions of Internet Explorer 10, enhancing the browsing user experience, primarily for video and Flash games, while preserving performance for mobile devices.

Windows 8 will be shifting from the traditional “Aero” UI to more of a Metro appearance and have continued updates to Metro apps until RTM.