With this hybrid device, HP re-enters the consumer tablet market after it discontinued sales of webOS devices including the TouchPad. HP has reset its tablet strategy around Windows 8 OS.

HP also announced touchscreen ultrabooks with Windows 8 including the Spectre XT Touchsmart ultrabook, which is the company's first laptop with a Thunderbolt port. Thunderbolt is a high-speed interconnect technology developed by Intel to shuttle data between host PCs and external peripherals.

The ultrabook has a 15.6-inch, high-definition touchscreen and a choice of Intel's third-generation Core processor. It is 17.9 millimeters thick and weighs 2.16 kilograms. The laptop also features USB 3.0, Ethernet and HDMI ports.

The laptop will become available in the U.S. in December starting at US$1,399. HP did not immediately provide information on worldwide availability.

HP's Envy Touchsmart Ultrabook 4 has a 14-inch touchscreen and a choice of Intel's latest Core processors. The ultrabook weighs 2.16 kilograms and offers up to eight hours of battery life. An optional Advanced Micro Devices graphics card can be added to the ultrabook to boost graphics capabilities. The company did not immediately provide availability and pricing for the product.