News Summary: Barnes & Noble introduces new Nook

NEW YORK (AP) — THE NEWS: Barnes & Noble said Wednesday it is rolling out two new Nook tablets with a high definition screen. The Nook HD, with a 7-inch screen (measured diagonally), starts at $199. The Nook HD+ with a new 9-inch diagonal screen, called the Nook HD+, starting at $269. They run on Google's Android operating system.

THE CONTEXT: The bookseller's move heightens the tablet wars heading into the holiday season. Barnes & Noble, the largest traditional U.S. bookseller, has invested heavily in its Nook e-reader and e-books.

WHAT'S NEXT: The new Nooks are available for order online and in stores beginning Wednesday. They'll start shipping in late October.