Lenovo IdeaPad K1
Appears to be another standard Android tablet with an aluminum casing. It has a 10.1" 1290×800 display, comes with Android 3.1, and a 1GHz dual-core Nvidia Tegra 2 processor. Internal storage is up to 64GB, with up to 1GB of RAM. The forward-facing camera is 2MP and the rear-facing is 5MP and a 10 hour battery.
The base price on the IdeaPad K1 is $449 for the 16GB version with release in August
Lenovo IdeaPad P1
This tablet is very similar to the K1, except that it runs Window 7 Professional with a 1.5 GHz Intel processor. This tablet can be souped up with more RAM, but doesn't include a rear facing camera. Instead of 10 hours like the K1, the Intel processor/Windows combination reduces the battery life to 6 hours.
The IdeaPad P1 has no price yet, and will be available sometime in the "4th Quarter 2011."
Lastly, this tablet comes with Android 3.1 or 3.2 and a 1GHz dual-core Nvidia Tegra 2 processor. The display is 10.1-inch at 1280x800px with interal storage ranging between 16 and 64GB. 1GB of RAM, a 5MP rear and 2MP front camera and a good collection of productivity apps. The battery is rated to get 8.7 hours while on Wi-Fi. A capacitive ThinkPad Tablet Pen is also included along with an interesting laptop case/dock accessory allowing for a full keyboard.
The base price on the ThinkPad Tablet is $499 for the 16GB version with release in August. Hands on video via ThisIsMyNextVideo