I have heard both sides of this arguement... Some well respected collectors feel that this is nothing more than a marketing ploy to get us to spend more money on something that is "Inside" the watch.
I have also heard the, " the only person who would care is someone who is going to try to sell it as genuine!" and I disagree with this strongly.
YES, it is entirely possible that the new movements would make it easier for someone to pull a fast one on a buyer. Someone who knows Rolex movements is still going to know that it is not a real Rolex movement. BUT, this will DEFINITELY make getting it past even a casual collector much easier.
I have a GMT IIc here today that will be getting some additional work done to it. It has the new 3186 replica GMT movement in it. There are a couple observations BEYOND the cosmetic that I would like to mention. First it is the cleanest replica movement I have ever seen delivered. Even under a 20x scope it was clean. It also uses a new double balance assembly bridge. It is common opinion that this creates a much more accurate movement because it reduces even the slightest of vibration. I can tell you that the watch on my desk is running +2 seconds after 48 hours with NO adjustments being made.
There was also discussion that this movements GMT hand moves exactly as the genuine. Is that not another new modification to the standard 28XX series movements?
And above all of this, the movement is pretty neat looking... How can we knock the factories for making advances and then complain about other silly issues.
I WILL TELL YOU HOW... It amazes me that they can basically build a newer/better 28XX series movement with all the pretty engraving BUT they still cannot get the damn rehaut engraving aligned properly.
Anyway, here are a coupl quick pictures of the new 3186 movement. I truly think that in the long run we are going to find that these new modified movements are better than the standard rep ones AND THUS in my opinion worth a little more just based on that and NOT just the cosmetic factors.