Why is there a question mark?
http://www.fairphone.com/wp-content/uploads/2015/06/Fairphone-2-key-tech-specs.pdf
I guess we could find that one out by looking at the modem specifications of Snapdragon 801.
One could add that this is possible with addon parts (third-party or from Fairphone) and Fairphone specifically mentions it as a future option.
How?
IIRC many people said (especially when talking about screen size) that overall size matters to them and it should not be much larger than edition one.
This is much more likely to happen since a SoC vendor with longer support was chosen.
Root will not be default so removing system apps might become even harder.
I’ve read (and given source elsewhere in the forum) that Google Apps will be preinstalled.
Search for “expansion port” on The architecture of the Fairphone 2: Designing a competitive device that embodies our values - Fairphone