Sony has just announced a keypad peripheral that sits on top of a DualShock 3 and SIXAXIS to allow QWERTY typing (it also appears to have its own Bluetooth connection and power source). A lot like the keypad Microsoft released a while back for the 360, it also has a touchpad for mouse support as well (that could even be used in some games). The pad will come in 8 different configurations/languages for PAL regions this November and there's no US release announcement yet.
[Kotaku] UPDATE: We just received the full press release. It's coming to America, but still not dated.