A quick online chat with Motorola, not that it helps much. There was just "some" indication that a 64GB will come:
[10:51:08 AM] Hi, my name is Milton. How may I help you?
[10:51:54 AM] Me: Will a 64GB version of the new Moto X be offered? If so, when?
[10:54:44 AM] Milton: Oh ok perfect thank you for your interest on our new products
[10:55:29 AM] Milton: To be honest with you we have no updates yet about that information just yet
[10:56:41 AM] Milton: But I suggest that you consult our website from time to time for any updates
[10:57:05 AM] Me: Ok. I may have to go with another phone with bigger or expandable storage then. Just so you know, many others have this same feeling.
[10:59:15 AM] Milton: Oh yes I understand, we just need to wait for it to be available for the 2nd generation Moto X however the 64GB capacity it is available on the Moto X 1st Generation ok
[11:01:27 AM] Me: Yes, i know, but I was only interested in the new one. Hopefully you'll release soon, or I will go elsewhere. Again, this isn't just me if you read tech blogs. If you include 4K video, you should offer bigger storage from the beginning really.
[11:02:50 AM] Milton: Yes I understand and yes hopefully we get it soon and we also get the 64GB available as well.
I may have threatened to leave for another OEM, but I'm still getting this when it launches. I just wanted them to get the message that people may be holding off purchasing if they delay the 64GB, which might result in them going with another phone. I know this guy is basically CS and may not have any info, or can't provide it if he did. Probably won't help much, but I've always felt, if you do or say nothing, nothing will happen.