Acer plans to release two Android-based tablets and a Windows-based system that will join other expected competitors to Apple's iPad. Acer, which has seen its lucrative netbook business slow as the market turns to tablets, introduced Tuesday at a New York news conference a Windows and Android system that will each have a 10.1-inch touch screen. The company's second Android tablet will have a 7-inch screen. The 10.1-inch models will have front and rear cameras, and all three will have Wi-Fi and 3G connectivity. A docking system with a full size keyboard will be available with the Windows system, which is scheduled to ship in February. The Android tablets are set for release in April. Acer did not release the names or pricing for the new products.