Other Lines of dialogue in A New Hope that could potentially Hint at things that will happen in Rogue one.

C3-P0 - “There will be no escape for the princess this time” - She escapes in Rogue One from a Situation possibly

Vader then when Leia is Captured Says - “You were’nt on any MERCY MISSION this time” suggesting he met her first when she claimed to be on a mercy mission.

Vader - “SEVERAL TRANSMISSIONS were beamed aboard this ship” There is more than one transmission made to the Tantive IV

Vader - “SEND A DISTRESS SIGNAL and then inform the senate that all aboard were killed” Vader orders sending the distress signal and not Leia.

Vader - “There will be no one to stop us this time” suggesting that something or someone stopped him previously from finding the hidden rebel base.

I am also wondering how the Distress Signal and killing all aboard the Tantive IV had anything to do with the Senate being dissolved as Tarkin references later on. Perhaps there was a loss of control.

If this whole “Mercy Mission” Sub plot does some how play out and the Tantive get’s let through a Blockade on Goodwill will we see the Millenium Falcon being stopped and boarded (No Character Appearances). The point at which Han drops his Cargo Instigating the Bounty on his Head. Probably a stretch but I am merely trying to connect dots.

I read about the Lord Tion story and I like that a High Ranking Imperial want’s to Marry Leia. Although he dies suspiciously. I doubt this will make the film but I am rooting for an Alderan appearance, it would really add more weight to the destruction when it happens.

I like the idea of being able to watch the 2 films back to back.