If you believe either AIK Hockey's website or Swedish news outlet Expressen, Oliver Kylington is coming to North America next season regardless of whether he makes the Calgary Flames roster or not.
A Google translation of a pair of articles from Sweden seem to indicate that Kylington will be loaned to the Flames fully rather than having to balance his rights in North America with AIK's rights. This does presume that Google's translations are reasonably accurate, though.
From AIK's site (via Google Translate), a quote from general manager Anders Gozzi:
Oliver did a very good camp and it opened the doors for him to reach the NHL right now.