I think at this point it is very likely that shallan and kaladin will end up together, may be not in the initial book but eventually . There has been too much fillers around them like the boot incidence and the chasm incidence , which could have been resolved by just having a scout report or something. But Brandon Sanderson is intentionally drawing attention towards this. Further Kaladin during the chasm incidence compares her with tien and there is a big change of heart seen in kaladin after that . On the other hand Adolin relationship is rarely mentioned. And the murder of Sadeas has made it more likely for Adolin to run away or be in prisoned.
Apart from this there are many other things that point at the same. like they belong to KR classes opposite to each other , their sprens also have an enmity among them . They are complementary to each other , one class believes in honor while other believes in espionage (some thing like Vin and Elend). Their attitudes are also opposite , while one hides his pain behind silence other covers it up with wit. The very idea that they are so different but so similar. One can argue that they are just counter balancing each other but still it would be much interesting to see them together. And I think the fact that kaladin killed shallan's brother may have a role in future books , in the same relationship struggles.