I'm torn. I like that they are trying to do something but I'm not really sure how it will pan out. This will actually increase the space on the rink (well except for the space behind the net) making it 1,4 meters (4,6 feet) longer from goal line to goal line. But at a quick glance it should mean more space for defenders to cover and more space for offensive players to use.
In short for non swedish readers:
The SEL will move the goal line back 2,3 feet (70 centimeters, 0,7 meters) closer to the boards, from todays ~13,1 feet (4 meters) to ~10,8 feet (3,3 meters). They will test it during the preseason and if it turns out ok it will be implemented from the start of the regular season. The reason is that the league wants a more open and entertaining attacking hockey to be played.
If I'm not mistaken this will make the space behind the net equal to the NA size.
I guess it never hurts to experiment in the pre-season.
Hopefully it's more thought-out than when they were experimenting with the puck out rule in the pre-season one year and first had it where you could get a penalty from anywhere on the ice. Obviously it wasn't that well thought-out, which Niklas Nordgren demonstrated when he got a penalty for lobbing the puck over the boards when he tried to score on a breakaway.