For you and everyone else reading; there is a dedicated AotP customs group working on a "second half" expansion for Zendikar to do that AotP block some actual justice - we've created new and excellently themed Planeswalkers, creatures, spells, terrain (including hedrons as an interactive terrain object) and scenarios! We're ~1.5 years of work into it, the set is pretty close to completion. I'm expecting to hold some kind of "playtest tourney" in the next few months to give everyone a chance to show us how they can break our fabulous new toys.
After our Zendikar release, designing and releasing a full-fledged Kaladesh set is next on our agenda. Further in the future we'd like to do Amonkhet, Ravnica, and many of the other planes, full with their own figures, spells, scenarios, etc. If you're looking to bring exciting new expansions into AotP, join the discord, we're often asking for help with playtesting!
Check out the Planeswalker's Reserve community on Discord - hang out with 35 other members and enjoy free voice and text chat.
discord.gg
Those wizkids miniatures should make it very easy for those future AotP sets to become a reality, we've been looking at lots of figure options.