Here's what will happen:
Ducky Zero 2108S = old Shine 2s, same functionality, new non-Cherry non-Costar stabilizers
Ducky Shine 3 = aluminum case + 5mm LED nonsense on spacebar, polling rate control, some other upgrades
Zero Shines will be $10-15 cheaper than current Shine 2s (why I would be hesitant to buy a Shine 2 unless you need TKL right away)
Shine 3 prices, who knows? I'm guessing $150-160 range if they skimp and have just an upper aluminum case. I can't see Ducky pushing much beyond that when cheaper Topre options are slowly being released.