I always wanted to see the MM pet customization. I would love Clockwork or Nemesis Pets for robts...etc.
As for a new threat....I Know several of the PK on Virtue always thought the Giant Nemesis robot in the mountain on Striga...would make another GM attack. Have it launch and say attack AP...would have been great fun In our opinion.
Another could be some sort of interdimensional type. Perhaps some of Mot's pals, coming to play...or to go with the Elder Gods....despite them being over done. A Demonic Invasion....akin to Planet Apocalypse.... I think wee could use a Magic themed one....bu tthat is me 🙂