I have a feeling there will be both, at least for the first generation. Same as the Escape currently has. Maybe not the first model year, though a standard hybrid has been "confirmed" initially.I would like to see just a Hybrid option, not plug in. I have a 2014 Cmax and my overall MPG is 44, which includes driving in winter and summer. From what I understand there is no tax incentive for just the hybrid model.
For me, the beauty of the plug-in hybrid is the ability to force it to use electric only. But then still have the safety net of hybrid driving after that. That way I can essentially drive to/from work completely on electric only, and recharge at night in my garage. Essentially never using an ounce of fuel during the week like my wife does in her Escape Hybrid.