I'd be surprised if there were not more dungeons added to Shuyal during the next 3-4 months. Remember that during Kraken expansion they added 2 more dungeons and Kraken Mines, and during Nordr they added the two dungeons discussed here and Arena. So I'm sure there is more coming, just give it time. I'm actually hoping they will take up my suggestion on the big mythic/arcane quest idea I posted.