This is by no means substantiated in any way other than a forum post, but a member of the FerrariChat forum is reporting that Lamborghini will privately unveil a new supercar based on the LP640 Murcielago (shown) and costing $1.5 million to a select group at the Pebble Beach Concours this week. The rumor goes that 20 will be made, with 15 earmarked for the U.S., and that the new supercar's official unveiling will occur at the Frankfurt Motor Show next month. We have people on the ground at the Pebble Beach Concours this week with cameras ready in case a tent flap gets blown up by the wind, and we'll of course be in Frankfurt next month, as well. Just how powerful and fast this new Lambo will be, and whether the rumor is even true, is still unknown.