Microsoft's introduces Microsoft's new tablet SURFACE during the press conference in Milky Studios on June 18, 2012 in Hollywood, California. AFP PHOTO/JOE KLAMARJOE KLAMAR/AFP/GettyImages

LOS ANGELES, CA - JUNE 18: Microsoft CEO Steve Ballmer shows the new tablet called Surface during a news conference at Milk Studios on June 18, 2012 in Los Angeles, California. The new Surface tablet utilizes a 10.6 inch screen with a cover that contains a full multitouch keyboard. (Photo by Kevork Djansezian/Getty Images)

Microsoft's Executive Officer Steve Ballmer introduces Microsoft's new tablet SURFACE during the press conference in Milky Studios on June 18, 2012 in Hollywood, California. AFP PHOTO/JOE KLAMARJOE KLAMAR/AFP/GettyImages

Microsoft's Executive Officer Steve Ballmer introduces Microsoft's new tablet SURFACE during the press conference in Milky Studios on June 18, 2012 in Hollywood, California. AFP PHOTO/JOE KLAMARJOE KLAMAR/AFP/GettyImages

This product rendering released by Microsoft shows Surface, a 9.3 millimeter thick tablet with a kickstand to hold it upright and keyboard that is part of the device's cover. It weighs under 1.5 pounds. The device is part of the software company’s effort to compete with Apple Inc. and its popular iPad tablet computer. (AP Photo/Microsoft)

This product rendering released by Microsoft shows Surface, a 9.3 millimeter thick tablet with a kickstand to hold it upright and keyboard that is part of the device's cover. It weighs under 1.5 pounds. The device is part of the software company’s effort to compete with Apple Inc. and its popular iPad tablet computer. (AP Photo/Microsoft)

Microsoft is making an announcement today, and speculation centers around what kind of tablet it might release. AP file photo