Meet the Lockitron Bolt: the next generation Lockitron lock with a more elegant and robust design than its predecessor. It still provides you with access sharing, activity logging, and Sense. The battery life has been improved as well. The lock features Bluetooth, but you can use a separate unit called Bridge to add WiFi capability to Lockitron.
Lockitron will sell the Bolt for $99 at this time. The preview version will ship in March.