Let me just start by saying this is the relationship that I think will happen, not the one I hope will happen.
I think Kaladin is being shipped with Shallan from the start, despite making an irritating love triangle. They are the 2 biggest viewpoint characters, they have both have been through hell, and they both seem to find the other attractive. Adolin just drew the short straw. Shallan likes him, but she wouldn't be courting him if she didn't need the Kholin name to help out her family. Now that she is a Radiant and can openly soulcast, she isn't in quite as tight a spot.
All the obstacles between Kaladin and Shallan just scream foreshadowing. She is also keeping a ton of secrets from Adolin, but she practically spilled her guts to Kaladin(while he did the same to her). Adolin is crushing on a pretty idealized version of her.
I kind of hope I'm wrong though, cause I am not Shallan's biggest fan, and this would actually make me feel sorry for Adolin. The one time he actually likes a girl and he can't get her. Stabbing Sadeas in the eye actually managed to get me to like the guy.