We know the age of Krakoa and by extension Arakko is just beginning so what exactly do you want to see that expands on the new status quo?
A few things i wanted to happen:
-mutant gods exploration (i believe Arakko has them?)
-the mutant afterlife explored (the waiting room)
-A book totally dedicated to Chimeras from either other realities or this one or BOTH! More juicy Sinister MESS!
I would also want to see eventually something of an okkara planet (a second mutant homeworld somewhere where both Krakoan and Arakkii flora and fauna flourish side by side). Give a team of mutants from arakko and Krakoa to govern it and run it.