The open rotor concepts, one of which was revealed recently by CFM partner Snecma, include pusher, counter-rotating designs very similar to the General Electric GE36 unducted fan (UDF) study of the 1980s, as well as puller-type designs.
Of more interest to me personally, are some of the quoted time-frames for the introduction of new-technology engines for A320 and 737 replacements:
However the company cautions that the more advanced concepts are still years away from fruition. Any open rotor design would not be ready for service until "very late in the second decade at the earliest," says CFM executive vice president Bill Clapper.
There's also some interesting information about the LEAP56 initiative.