Nice. Post-processing is truly t3h s3x. I kinda want lens flares in game now (I see beam turrets breaking whatever flare shader someone might come up with though...). Are you considering motion blur for the fighters at any point? It might alleviate the awkwardness of the flight paths that are going on when everything's rushing out of the portal. Slight depth of field effects on the lucifer so that not all parts of the ship are crystal clear might also be nice; something looks off about the drifting lucifer piece, but I'm not sure what it is or what might fix it.
Another small thing: The moon and the earth look really, really bright. Actually, so does everything after it comes out of subspace. I think it might be better if shadows were stronger, lighting dimmer, less saturation or something to fix that issue. I'm thinking that it might just be a result of you not being done with those scenes though.
Explosions still look tacky. Sorry! >.>. I think it's because they look far too clean. Have you thought about having chunks of hull fly out, with small smoke trails coming out of the holes long after the explosion's finished? Not exactly that realistic, but hey, rule of cool. If FS2 intro can do it...
But disregard the criticism. I'm just an idiot ranting on a WIP for a final cutscene that's going to blow my mind. Right?