Soon our fleet will be getting upgraded/replaced and the contenders were the ATR600, Q400 and ERJ190. The 600 and 400 were most likely with a view to the 90seat products ATR and DASH are looking at building, one a stretch of a old technology the other off a clean sheet with all new technology available.
It would seem Bombardier could use the new CSeries 5 abreast fuselage and many systems as a starting point. They did the same with the Q and CRJ series. C110 fuselage / cabin:
A new wing & tail would be neccesary (althoung Embraer plans to use the E190's wing for the above mentioned high winged C-390)
Also good news from the engines front new heavy turbo shafts : GE38-1B (7500 hp), Honeywell a new T55 version : 55-L-71X (>5000 hp) and Rolls keeps improving the AE2100 (max 5000 hp).
GE plots GE38 engine's future in emerging heavylift market