Its your car and therefore unless you have a build week (which I assume you don't and in any case the earliest any of our cars will be built is week 22 ie. end of May)
Completely agree that up until build week is assigned you can make changes. These changes may delay your car, probbaly not the colour change, but if keyless entry components are in short supply then maybe.
My dealer rang me today. He likes to give me a weekly update unprompted and when the order tracker started displaying "error" as if there was something wrong with the order, he rang VW UK for an explanation and update for both mine and my dad's GTDs. VW UK rang Wolfsberg who confirmed that the orders are in a kind of stasis as no GTDs/GTIs will be built until MY14, beginning on week 22. They apparently told my dealer that the cars will be most likely here for delivery in early July, maybe late June.
Considering when mine was ordered, I would expect most others to expect theirs then too as my order was accepted electronically on March 30th, and ordering was only open a few days prior to that.