From the verge:
HP building multiple tablets this year: 'we want to be the number one computer vendor' | The Verge
HP's Slate 7 is just the beginning. The company sees the writing on the wall: if you add in all the iPad sales, Apple — not HP — is selling the most computers these days. So, faced with declining PC sales and the growing popularity of Apple's slate, HP has decided to build an entire portfolio of tablets, both Android and Windows, to maintain its position in personal computing.
"WE NEED TO BE IN THE TABLET SPACE."
"HP is the number one PC manufacturer in the world, and we want to be the number one computer vendor in the world. That means we need to be in the tablet space."