Apple during their live stream broadcast talked about the upcoming iOS 4.1 for the iPhone and iPod touch. "The new improvements include fixes for a lot of security issues, bugs and adds a lot of additional features. iOS 4.1 will include GameCenter, which allows you and your friends to play games together by sending invites, which notify you in-game."
Apple said iOS 4.1 will be available next week on iTunes, and is a free upgrade.
Apple demonstrated and showed off iOS 4.2. iOS 4.2 will be available for iPhone, iPod touch and iPad, the first 4.x update for the iPad since it's launch in April. The update will bring functions like printing and AirPlay, so you can stream your video and audio right over WiFi. iOS 4.2 is scheduled for release in November 2010.