Google is unveiling its Googlebook lineup tomorrow in New York City with six confirmed devices from Dell, HP, ASUS, and Acer, but evidence suggests a seventh device—a mysterious third Lenovo clamshell—may also be announced. Based on render leaks and code tracking, the unrevealed machine appears to be a 14-inch Lenovo Googlebook powered by Qualcomm's Snapdragon X processor, completing Lenovo's three-device lineup.