Sony will make its long-awaited entry into the tablet PC market later this year with two models based on the latest version of Google’s Android operating system. Two Android tablets that are quite different from a lot of the competition, the Sony Tablet S1 and S2 devices promise to be very desirable when they launch later this year. S1 and S2 are code names. Launch date and cost has not been described yet. Watch videos of two brand new tablet PCs.