This phone is currently available in US, it will be available in UK during Christmas time 2009.

Palm Pre, the first phone based on the new Palm webOS^TM mobile platform, brings your information from the many places it resides – on your phone, at work or on the web – into one simple, integrated view.

Palm Pre introduces a breakthrough user interface and hardware design that makes it one of the most integrated and user-friendly mobile phones on the market. Featuring a smooth, elegantly rounded ergonomic design and a physical keyboard that slides out only when needed, Palm Pre is engineered to feel natural in your hand and comfortably small in your pocket. When closed, Palm Pre is ideal for phone calls, web browsing, music, photos and videos; when open, Palm Pre is optimized for email and text messaging. It provides an exceptional experience for phone calls, whether held to your ear, over speakerphone or via Bluetooth.

O2 UK website has listed Palm Pre as coming soon model:

Customers who would like to register to receive additional information about Palm Pre and be notified when it’s available can register at:
• UK and Ireland: http://www.palm.com/uk-pre-notify
• Germany: http://www.palm.com/de-pre-notify
• Spain: http://www.palm.com/es-pre-notify

Source: O2 Press Release