It took quite a while but the latest to join the fray is Motorola with their Krave™ ZN4. It features a transparent cover over a touch screen. Users can actually access several features without even opening the cover. It is expected to go on sale in the US on Tuesday for $149.99 on a contract with Verizon Wireless. No news about the UK though.
I am not sure whether it has GPS though. No mention about it on their press release.