[–] brownja 0 points 1 point 1 point (+1|-0) ago
Lot's of questions and misinformation in the replies here so I'll try to address them in a single comment.
Belt drive bicycles have been around for a while, so while this is not that innovative from a technology standpoint, Ikea bringing it to a mass audience is.
Belt drive bikes can be used with internally geared hubs for multi-speed applications. http://www.gatescarbondrive.com/bikes/
Belt drives are clean, quiet, and low maintenance which makes them good for casual riders and city bikes.
The main compromises; The requirement to use the afore-mentioned internal gears, which can be a bit heavy and/or expensive.
The requirement to have a cut-out in the chain-stay or seat-stay for belt replacement.
Re: trailer and right-turns: The arm is curved out and back in to the hub to allow the wheel to swing in that direction.
[–] Clientkill 0 points 10 points 10 points (+10|-0) ago
We are already doing it, belt driven bikes have existed for some time.
[–] Gardmeria 1 point -1 points 0 points (+0|-1) ago
How are you supposed to turn right with that trailer?