Wow. This is fantastic! I cannot believe how good this is! I mean, I'd still rather have the other eight episodes of the season too, but imo they're definitely achieving that 'event' they were hoping to achieve. This story has me on the edge of my seat and I don't think there's anything about it that I'm not loving.
Plus, we're getting Jack backstory, at last! This is what I was hoping we'd get from Torchwood. Stuff that Jack has done in the past coming back to bite him in the arse, because, hell, most TW staff aren't still around several decades later but Jack always will be.
This really, really is excellent stuff.
ETA: I meant to mention, because it's quite a huge event in itself - Jack didn't die this episode!!!!!