At the stage we are at, we cannot make incremental progress. We have something working, a prototype, but to make progress we have to re-arrange things, and such re-arrangements affect overall design.

I cannot say: we need foo, then bar, then baz. Because that's just one idea. Perhaps a talented programmer will join and say: we can do quux and frob instead, and it will be better than what I thought.

If you want to see some list, here's NGCCC overview:
https://github.com/bitcoinx/colored-coin-tools/wiki/The-next-gen-colored-coin-client

And here's WebcoinX bugtracker: https://trello.com/b/n4qoNDDI/webcoinx

But that's pointless. I don't want people to grab tasks to do, I want them to discuss development strategy first.