Barnes & Noble Inc. (BKS), fresh off an offer to be acquired by John Malone's Liberty Media (LCAPA), unveiled a new version of its popular Nook electronic-book reader with a touch screen, a two-month battery life and the latest version of the e-book industry's e-Ink technology.

Customers who pre-order the device, at $139 apiece, can expect delivery by Father's Day, Chief Executive William Lynch told media and invited guests at a press conference at its flagship Union Square store here.

Lynch also said Barnes & Noble believes its Nook Color device, at $249, is the best selling tablet using Google Inc.'s (GOOG) Android software and second only to Apple Inc. (AAPL) in terms of overall tablet sales. The company recently added more tablet functionality and an application store to Nook Color to enhance what it calls the "Reader's Tablet."

The previous versions of the e-Ink Nook will be phased out and discounted by $30 to $119 and $169 apiece, respectively, for the WiFi and 3G versions, while supplies last.

New Nooks will hold up to 1,000 books and are the easiest and most portable e-reader ever, Lynch said.

Barnes & Noble is fighting to further entrench Nook as the No. 2 e-reader series. It believes it controls more than a quarter of the e-book market, with Amazon.com Inc. (AMZN) boasting most of the rest. Various estimates put the rapidly growing market at $1 billion this year, with the potential to nearly triple next year.

Executives in a question and answer session declined to discuss the Liberty offer or dissident activist shareholder Ron Burkle. Burkle's Yucaipa has mostly kept to itself since losing a proxy battle last year to unseat Barnes & Noble Chairman Leonard Riggio and two other board members, but late Monday announced the purchase 603,000 additional shares.

The purchase brings Burkle's stake above 19.7%, closer to a 20% threshold that would trigger Barnes & Noble's shareholder rights plan. The company instituted that poison pill to prevent Burkle or others from taking control of the company at a price it feels is too low.

By increasing his stake, Burkle, who unsuccessfully tried to have the pill threshold raised to at least the 30% stake that Riggio owns, positions himself to better challenge the Liberty offer should Barnes & Noble accept it and Burkle deems the $17-per-share bid that values the bookseller at $1.02 billion too low.

Liberty CEO Gregory Maffei was in attendance, and was seen chatting with Barnes & Noble CEO Lynch about new ideas for digital books following the question-and-answer session. Lynch and Maffei left the event together, and both executives were smiling and chatting about their families.

The stock has been driven past Liberty's offer by merger arbitrageurs and other investors who agree with many analysts that a higher bid is warranted. Barnes & Noble reportedly had hoped for an offer of at least $20 a share when it put itself up for sale last August, but attracted no public suitors until the Liberty offer was made public last week.

Barnes & Noble shares were up 2.3% at $19.02 shortly after 11 a.m. EST.

-By Maxwell Murphy, Dow Jones Newswires; 212-416-2171; maxwell.murphy@dowjones.com

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