If anyone knew when the guys are coming to Sweden, you would surely find the tour date and venue info here: http://www.poetsofthefall.com/tourdates/
If it's not here, no-one knows anything. Except maybe from the agency which takes care of booking Poets' gigs.
Please remember that touring abroad is for Poets, as an independent band, a hard thing to do. They need record sales in given country, gig organizer, enough fans to attend the gig and it has to be profitable, of course. They've played in Sweden before and it's possible they'll play there again, but you have to be patient. That's all I can tell you from my knowledge.(Or, if you're patience is running out, Helsinki or even Turku is not that far away from Göteborg... just saying (and that comes from a person who travelled longer distance to see them live).
BTW, that question could be easily asked in gig info thread to avoid creating new topic, but you since you probably haven't known it...