Ok guys, I have most of the details on the Google Event on the 29th

New Devices:

There will be three new devices revealed by Google,

• The new Nexus phone by LG - Nexus 4
• A 3G version of the Nexus 7
• A 10 inch Tablet by Samsung - Nexus 10 (with a very high resolution)

New Android Features:

• Huge improvements to Google Now, cards will be different, a card comparing how much you've walked across months and a card that pops up when ever you go to a new city, showing all the POI's and distance to them
• Changes to the Camera interface
• Notifications get further improvements, now you can read entire messages in the notification center
• UI improvements for bigger tablets.
• And the keyboard will come with something similar to swype
• [UPDATE] Profiles feature is coming for the tablets, not sure about the Phone

There can be more features that may turn up, these are the ones I'm 100% sure of.