It seems reasonable that they would have claimed that they open two new lounges if they opened both a SAS Lounge and a SAS Gold Lounge. So expect a SAS Lounge #2, i.e., no actual booze.

And regarding Swedavia and SAS potentially "colluding": I'm very much not impressed by the way Swedavia runs Arlanda, but I'm fairly certain that Swedavia doesn't take any instructions from any airline about how to treat other airlines, and I'm certain that they (within the confines of the somewhat randomly built airport they run...) try to be very accommodating to all the three major alliances. Six Star Alliance carriers fly long haul to ARN, at least seasonally (UA, AC, ET, TG, CA, NH), and widebodies basically means T5 pier F at ARN, so I'm fairly certain *A & LH group will stay at terminal 5, with a large presence at pier F.