This one looks much better than the previous posted one
http://www.italiaracing.net/notizia.asp?id=42254&cat=21
unfortunately the article is only in italian, but it basically says that Oreca is working on a CN2 car, because this marked is experiencing a "boom" in latest years.
I have worked myself on these cars for some time and i have to say they are pretty good to drive and work on, regulations are pretty free. Moreover they are pretty fast too, in Spa for example they are definitive faster than GT cars for example (pole when i was there was in the region of 2' 17'' xxx).
Engines are, as said, group N, so power in the region of 250 hp. I guess it is impossible to think to their use in Wec environment, but still they are very interesting.
Strange to read in the above article that they are planning to use a Chevy engine. Till now Honda was the only reasonable choice.