I think the only thing I'm concerned about is that, like LittleNikki said, his romance arc wouldn't be counted in the grand scheme of things, like if Varric was to have a friendly chat with us about our choice of romance option, I'd be kinda peeved if he done it for all the romanceable companions but not Cullen, or if someone died on us or a bad thing happened and Cullen didn't come to comfort our character like a romanceable companion would, or not being able to have a last goodbye before the final battle etc. Hell, even Hawke got to see Cullen before/during the final battle in DA2, LOL! 
That's something I hated about ME3, actually. I mean, my Shepard romanced Kaidan, so she was able to have her last goodbye with him, but the Shepards who romanced Cortez/Traynor or the other ME2 companions only got to talk to them over a comm station.
I guess the fact that DAI was given an extra year and has been in the works for over 3 years is a little reassuring.