I think Paradox's page 3 "article" was spot on. Kaladin and Shallan (although I didn't want to admit it) have real potential where Adolin and Shallan do not. I also don't think there will be a love triangle, or if there is it will be short lived. I hope/ think Adolin will find someone that is hard for him to handle. Most of Shallan's and Adolin's interactions have been her pleasing him or attempting to use him in some way. If you compare that with the interactions with Kaladin, there really is no question in my mind that Kal/Shal will happen.
As I mentioned earlier I could see Adolin finding someone not of noble birth and falling for her etc.
Also people keep mentioning all the hardships Kal and Shal will have to go through (Kal killing Shal's brother, opposite spren etc) I think those things will not only bring them closer as they overcome them, but be exciting writing points in the story.
After the WOK I thought a Jasnah/ Kaladin thing could happen, but I am pretty confident Kal and Shal will make all kinds of awesome Radiant babies.