With the most recent update to the Xbox it now fully supports M&K and many devs have already implemented it (looking at you Warframe) and its done heaps better than I had expected it to be at launch. At this point I can't see any reason frontier would be unable to support mouse and keyboard control as well, the base line is already there as they have a PC version of the game and typing in game already works so they are at least registering you have a keyboard plugged in. With 3.3 Dropping VERY SOON now would be the opportune time to at least address whether its simply "in the works" or if Frontier has "No plans at this time"