I find it oddly difficult to draw conclusions from that trailer. They didn't really choose the best lines necessarily. Gillian Anderson is absolutely full of pathos, though. She's really on top of her game these days.
Also I wanted to comment on how great Sleepless's podcast has been. (It's called X-Philes Talk X-Files
, by the way. Download it!) It really feels like a team effort at this point; everyone seems 100% invested and involved in each episode. I think it's a mark of maturity when episodes start to go long. (You can see it happen in particular with Judge John Hodgman and How Did This Get Made at crucial points in their development. They more than doubled in length.)
It would be great if you could all meet up at some point, set a few microphones around a table and record like 3 episodes. That would be great. Nothing beats an in-person podcast.
It did sadden me that there was no one to sing the praises of Folie A Deux, my favorite episode. To respond to your criticism, I think the unusual structure is brilliant. It throws you off and contributes to the feeling of unease, that something is very wrong beneath the surface (a Lynchian touch). Also I think it's one of the series' very best iterations of the "oh, maybe the nutjob was right" scenario.
Todd VanDerWerff's review
does a great job illuminating why the episode is great. Worth a read.