It's for ARN-LHR. I noticed another interesting thing that I haven't seen before on the SAS website.
It seems there is now a fare indicator in the HTML code which reflects the fares that are pre-selected in the screen you get after choosing destination and dates. It looks something like this:
Code:
<META name="WT.pn_gr" content="T"/>
If you choose the Christmas offer, this one comes up as T for the CPH-TXL offer (as Chriscross mentioned above) but as V for the ARN-LHR offer. In other words, it seems that the ARN European offers book in V again this year! ^ The only thing I'd worry about is that this somehow will get "converted" to O-class later, but I'm willing to take that chance.
Edit: Did a booking and e-ticket receipt confirms V as booking class.