Embraer announced that it will take a pass on developing a New Small Airplane in the 130-155 seat class and instead re-engine the E-Jet series, possibly with stretch to 133 seats (smack in the middle of the Bombardier CSeries 100/300 size). Targeted entry-in-service (EIS) is 2018.
Aeroturbopower, which focuses on engine stuff, already has this back-of-the-envelope analysis.
As Aeroturbopower notes, EMB favors a one-stop, trans-continental airplane (2,000-2,200nm) over the full transcontinental range of the CSeries (although BBD offers a lighter-weight CSeries with 2,200nm range as well). About 90% of the US domestic flights are within this range but the E-Jet is 2×2 vs the CS 2×3 seating. Aeroturbopower concludes the E-Jet will have lower seat costs.
Aeroturbopower also compares the E-Jet with the Mitsubishi MRJ.