Don't worry about Kingmaker. No narrative connection
Apart from Tristian's single comment about the Worldwound and all the badness going on there, no? But otherwise - yes, it appears to be entirely separate.
There's also a kingdom problem...
...in which you send troops to the Worldwound to support the Mendev Crusaders against the demon invasion. So the two games happen at around the same time, which sounds like DAO and DA2.
Some very minor spoilers (it's even mentioned in the trailer I think but if you're really don't don't read):
The world wound is a thing for a 100 years when you start wrath and there have been many crusades
So it doesn't necessarily mean they happen at the same time. But the comparison to da1-2 is a good one
