Are they still committed to breaking one of Gimp's best features: "Intelligent Save" ? (Inferring file type based on extension)
Splitting "File > Export" and "File > Save" is counter-intuitive; it's not DWIMish, and I guarantee more people will be frustrated that the Save dialog box is "broken" when they try to save a JPG and end up with an XCF file instead. "File > Export" reeks of being Designed By Developers, rather than actually taking user behavior into account.
(And stealing the keystroke for "Fit In Window" is just adding insult to injury...)