I like very much the idea of the blue legends.
I hope that you can add to the set an option made of 4 blank 1u keys, each set could be made of four keys r1,r2,r3,r4. This could allow to have international sets with some blank keys, that's better than having a wrong symbol printed on the keycap.
Also, for those who live in Europe, it would be nice to have a proxy, to avoid taxes.