Aquaman has been well written for most of his solo series post the DCnU 52 reboot. I would love a JLI series with Aquaman as one of its members and perhaps even the leader. I also would like to see even more political interaction and drama between Atlantis and some of the other fictional nations/locations such as:
-Themyscira
-Gorilla City
-Feithera
-Nanda Parbat
-Skartaris
-etc.