Google have sent out invites, unfortunately leaving me out, for an event to be held on October 29 in New York City at 10am. The event is shrouded in secrecy, with the only tease from the Mountain View-based company is that it has to do with Android, and states "The playground is open".
Stating something like "the playground is open" could mean that Google are talking about Android development, opening it up to more partners? Possibly opening up the Nexus program to everyone, pushing out Nexus devices without custom UIs on top? Teasing the next-gen Android to be much more open than it already is? It's anyones guess right now.
The latest Google-related rumors have been of Android 4.2 Key Lime Pie, the LG Nexus device, a 32GB Nexus 7 device, and a couple more. But that doesn't really tie in well with "the playground is open". The end of October is busy with Apple on the 23rd with their iPad mini event, the same day sees Microsoft with their Windows Phone 8 event, Microsoft on the 25th with a Surface event in NYC, and Microsoft yet again on the 26th with the launch of Windows 8.