Apple will be livestreaming their special event via their site today (October 22nd), where they should be announcing some new products and software.
We will most likely see a new generation of the iPad and iPad Mini. Both may implement the new fingerprint sensor, Touch ID, into the home button which has been a hit on the iPhone 5S. The iPad Mini may also get a new retina display but keep the same design and size.
We should also find out more information on OS X Mavericks, the new Mac OS coming from Apple. As well as information on the new Mac Pro which they promised will be available by the end of this year.
The event will be live at 6PM London time.