The ruling is now available on the homepage of Skatterättsnämnden (in Swedish only, sorry). Apparently Skatteverket ("the tax authorities", "IRS") has appealed the decision which means that it will be tried in Högsta förvaltningsdomstolen ("Supreme Administrative Court"). My contact said that she doesn't know how long this will take and it might even be brought up to the EU court in which case it will be a long time until I have a final decision.