We always want more, that's human nature and with an FPGA design it's actually possible
Personally I think the Indy Mrk2 is already a great upgrade which I'd recommend to everyone.
Things I'd like to see supported in the future:
1) SuperPlus Mode identified as a distinct mode so that it can be configured properly
2) 50Hz support
3) Graffiti (enhanced!)
4) Vsync (if possible)