Received my nmp 12C/D700/64GB/1TB on April 10th and was extremely excited.
Spent a couple of hours installing all my software and go to start working and hear an extremely annoying high pitched noise coming from the computer. Call apple and go through some trouble shooting and they send me to my local apple store and setup an appointment for that day. Apple technician says it's the fan. I didn't think it was the fan but give him the benefit and he checks it in and I wait 4 days for a new fan part only to get it home after being "repaired" to hear the same annoying noise. Call apple and they're sending me a replacement but now have to wait 3-5 Weeks. Not happy at all about that. I pray that they're aware of this issue and have a fix already in place on the assembly line.
Anyone else have this problem with same build?
Look here and also search for the "coil whine" thread.
As long as Apple is letting you keep your current nMP until you receive your new one I think you couldn't ask for better support.