Grainy images have emerged on Twitter this evening reportedly showing the new Nissan LMP1 prototype undergoing testing at the Circuit of the Americas in Austin Texas.

Pirelli World Series Accura factory driver Ryan Eversley posted the pictures this evening sent from a friend. Sadly, they show no real details and do little more than keeping the rumour rill going, however, it is said that Nissan’s new challenger could be front engined, something which, if true, is sure to shake up the field some what.

Nissan an is scheduled to unveil the new car at the Superbowl in February.