Everything Tesla has said so far about the Gigafactory is that it's ahead of schedule, but that only goes toward not making the debut of the 3 late due to lack of batteries. The GF could open tomorrow and it wouldn't do anything to get the 3 out early. But as far as the reveal goes, I think that's just Tesla throwing us a carrot to momentarily occupy us. And perhaps also to gauge interest. Production is far enough out with the March reveal that they'll be able to react to any major show-stoppers brought up my the forums here. For instance, when people start saying they'll never buy a car with only three wheels and just one front seat (for the driver), they'll add a 4th wheel and make the car wider. Okay, maybe that's a bit extreme, but you get my point.