It seems they are progressing fast.
GE says they are confident to power the C919. question is if they will offer the state of the art LeapX engine.
GE says confident of winning China engine contract - Yahoo! Finance
That could make it 15% more efficient the current narrowbodies.
A long variant is planned offering more then 200 seats and A320 containers competability..
Airbus and Boeing sofar siad >2020 for their new designs.