Here's the new engine:

http://www.sae.org/aeromag/techinnovations/1298t10.htm

http://en.wikipedia.org/wiki/Pratt_&_Whitney_GTF

http://defence-data.com/current/page38895.htm

The Press Reports do not have all the latest numbers, but the engine's current rating is 30,000 LBS. It turns in 12% better fuel economy than the best GE / Snecma / CFM numbers while running quieter and has the benefit of being much simpler to build and maintain.

The articles pass it off as an "RJ" engine, but 30,000 LBS is clearly in the thrust range for a 737-800 sized jet. Make a 737 out of composites and 30,000 pounds of thrust would probably go all the way to 180 - 200 seats.