I'm also an owner and I don't think that it especially effects the desirability of the watch that they have released another color of the same edition. It certainly won't effect my wearing of it.
I can vouch that Louis, at Hodinkee, designed the visuals of the watch because he showed me several versions of the dial, crown, logo etc. that they went through before they came up with the final formula.
Since that formula worked well (sold out while I was at the intro party) I guess Zenith decided they could recoup a little more on their R&D time by making another edition.
I do think though that "milking" a good design is a lot of why this industry is suffering now. By meeting or exceeding a demand for each watch they create, they give no reason to "jump" on the next watch. In 25 years of collecting, there are not many times I can say of a new watch "damn, I really missed out on that one." Thus one more reason the vintage market does well while the new market is collapsing.
Just my .02, but happily wearing the Hodinkee watch and I won't be selling mine.