It really depends on how they prioritize. For example, it might be all preorders first, or first come first serve, or distributors and partners first. It's hard to tell without knowing how many people is on the preorder list.
I'm definitely not getting the custom, and thus have no idea how long I have to wait. But someone mentioned 5 to 6 weeks and I guess that's an accurate estimation based on how long i waited for my previous custom, and taking into account that UM has backlog to clear and new units to ship out to distributors.
If the universal is really to my liking, I can theoretically just buy on the spot. Stereo supposedly have them in stock and you can walk out of the shop with one if you have the money for it. While I do have the savings for one, it will be a couple of month before my budget allows it. In addition, there will be other items that I'll be auditioning too (the JVC SZ2000 for one). I will post a preliminary hands-on next Monday, mainly as a comparison to my JVC FXZ200, my primary earphones now.