This article describes ATR's plans to launch a larger successor to the ATR42/72 familly around 2015:
http://www.flightglobal.com/articles...op-family.html
It would be in the 80-90 passenger range.
Formica says: “The most important thing is the engines. We are discussing with Pratt & Whitney and Rolls-Royce about a new-generation engine able to power this next generation of turboprop.
“If we want to be competitive in [the 80- to 90-seat] segment, we have to maintain the 30% [cost-saving] gap and to keep the gap we would need new technology.”
ATR has just launched its new -600 series. Formica says around 11 airlines, primarily from the USA, have expressed an interest in the -600.