I don't have a clue! There aren't many different airlines in Sweden and I haven't heard anything about it.
Maybe it's a new startup airline which will receive them?
Falcon Air sounds quite believable though.
Braathens is an Norwegian carrier.
OK I have been in contact with the Swedidh FAA (LFV)and they have not heard anything about a new 737 operator, so Falconair could be the one.
If so then their fleet will consist of 5 737