wily social media hounds over at Lenovo are at it again, this time teasing us with a crossword puzzle relating to a new "ThinkPad Series" of machines. Referencing our handy, and so far wholly accurate, leaked slide from February shows that the only Think-branded laptops not yet revealed are the midrange L series. Positioned to replace the aging R models, the L400 and L500 are expected to slot in as bulkier alternatives to the premier T-label ThinkPads. This puzzle tells us that whatever the new computers, they'll be firmly focused on energy and resource efficiency, and for an extra bit of PR kick, they are likely to be announced on Earth Day 2010, which just happens to be this April 22nd. Let's wait and see what Lenovo does to justify the name change and grab for green attention, eh?