Will this EPR NM actually be more like the REP 2000 that EDF had originally in mind ?
Sorry, I don't know (and I guess that if I knew something I would not be authorized to say it).
It seems to me that the French need to make up their mind, despite the "grand carenage" maintenance programme of the current nuclear power plant fleet. The current 58 reactors will need to replaced with new reactors at some point.
As you said, the plan is to increase the lifetime of the current reactors of 20 years in order to achieve a lifetime of 60 years, if they can pass the safety tests. For now France exports 12% of its electricity production, so if there is no more ecomical growth (like the last years ) there is no need for building new power plants, that's how I understand the situation. Maybe they will not extend the lifetime of one or two reactor and replace them with a new reactor in order to not loose to much experience, I don't know. There is also the ASTRID project (a 600MWe sodium fast reactor in order to prepare the generation 4), but the decision to build it or not will be taken after 2017. I see that some people in USA are speaking about a lifetime extension to 80 years for some american reactors so maybe the reactors in France will be extended to 80 years, or maybe there will be a nuclear phase out because of a new major accident.
EDF and Areva will try to get some contracts and build reactors in other countries, it is maybe the main purpose of the EPR NM.
Or is France going build new coal-fired and gas-fired power plants ?
Well, the current government (the socialists) passed a law which says that the part of nuclear electricity production must be 50% in 2025. I hope that the next governments will cancel this stupid law but you see that the politicians can do everything.