Similar to the Royal Stockholm Philharmonic, the website of the Berlin Philharmonie has a search engine to retrieve information from past concerts. From this I was able to find a performance of Pettersson's Symphony No. 11 by the Deutsche-Skandinavische Jugend-Philharmonie led by Andreas Peer Kähler, the conductor of the world premiere recording of the Symphony No. 5. As this is a Pettersson year I figured that Mr. Kähler wouldn't be neglecting the Swedish master, and doing a little internet research I was able to find another performance of, you guessed it, the Symphony No. 7.
Considering the fact that Mr. Kähler has performed and recorded the less-frequently performed (i.e. almost never performed) Pettersson symphonies, I was hoping that he would continue this trend and treat us to another Pettersson rarity, but I guess this was not the case. Perhaps Mr. Kähler has other Pettersson projects brewing--let's hope so.