yes, the silver dial color was discontinued was apparently discontinued in the 15500, due to legibility issues, and that it was the least popular color as quoted by my agent. But I do not know if that is the truth or not, but frankly, I never took to the white/silver dial personally.
With regard to your question, G, you know that the 15400 and 15500 look (and probably will feel) very different and some like it and some do not. For those on the 15400 waitlist looking forward to their first 15400, I think they will mostly get on the 15500 bandwagon so as to continue to be on the list. A few may dislike the 15500 enough to give up their slot and buy the 15400 in the used or grey market but I think this will form the minority.
I had spent days looking at pics of the 15500 and concluded that at least from the pics, I like it. I will still keep my blue and black 15400s and evaluate how the 15500 feels on the wrist when I put it on. For now, I like the new movement, the cleaner dial, and shorter markers. But without seeing/feeling the watch in person, it is hard to provide a complete evaluation of the watch. I am sure AP must have done their homework in creating the 15500. There will be people who like it and people who do not, the same for any other new model from any brand.
