The Galaxy Tab family now numbers three, with the announcement of a 9-inch version to fall between the 10- and 7-inch versions, Samsung announced today. The new Galaxy Tab 8.9 skims just under the thickness of the new iPad 2 at 8.6 millimeters, and will run Samsung's own skinned version of Android 3.0 Honeycomb called TouchWiz.

The Galaxy Tab 8.9, like its 10.1-inch brother, will be powered by a dual-core 1GHz processor and will come in both WiFi and 4G HSPA+ network versions. The Tab will also have a 2-megapixel front-facing camera and a 3-megapixel back-facing camera.

Samsung tied the announcement in with an official introduction of the Galaxy Tab 10.1. Both of the new tablets will have 1280x800 resolution displays and measure 8.6 millimeters thick, with the 10.1 weighing in just under the iPad 2 at 595 grams (20.9oz) and the 8.9 at 470 grams (16.5oz). The tablets will be available in 16GB, 32GB, and 64GB configurations, with a microSD slot that can expand storage by an additional 32GB.

There are scant details on the nature of the TouchWiz UI, but we know from our extended look at Honeycomb on the Motorola Xoom that the OS could stand a little smartening up. Prices and release dates have not yet been disclosed.