The raunchy lines bit convinces me enough to be happy.
Raunchy's always good. Guess Cullen's been beating himself up for not taking Amell's/Surana's offer for sexy times in DAO, so he's got all that pent up sexual tension going on 10+ years. Implications... pleasant.
I really can't picture Cullen getting extra cozy with just anyone, though. That would seem quite out of character for the guy, which leads me to believe he'd have to develop a meaningful relationship with a certain someone before he'd kick it up a notch. With a hypothesized 1,500 spoken lines, he's either a very talkative NPC, the new town crier, or he's a companion.
Hmm, if only we could ask Ms. Black how many VA sessions (or hours) she's done so far, then we might be able to compare her amount to Ser Ellis'. We know Morrigan's coming back as more than just a cameo, so I'd label her as an important NPC. If Cullen's an important NPC as well, their lines would probably be close in number. I dunno, it's just a thought.