I have been working on hardware revision for the past few months and am almost ready to share it / hopefully make available! The new cartridge will be RP2040 based and will run CircuitPython, which is making development / customization much, much easier. If you want updates, I have added a mailing list signup link to https://www.hotclasps.com (it's slow, I know).  I might create a second hacakday.io page once I am done, but I will be sure to link the new one here.