So I fiddled with 2.5 for a few minutes yesterday, and I think this is going to be an awesome patch. Performance is crap right now (apparently better as of new patch this morning), but once they get it running at reasonable speed it'll be great. The lighting pass that they did made a huge difference to the visual quality, at least for me. FPS movement feels much smoother, head-bob is totally gone, ship HUD's are being reworked, and I think the little Argo is going to be a massive hit. Also, the overhauled ArcCorp runs incredibly smoothly now.
All in all, I love it, and I haven't even been to Grim Hex yet.