notice your ship date changed to January? Add certain items and it changes from dec 30 to January: change from base processor/ram/gram, or add pre-loaded software and you'll have to wait.
Ram available from OWC (macsales.com) in 32 or 64 GB. (pcie ssds not yet).
Sharp 4K monitor seems to only be available with custom build, not finding it in Apple's online store otherwise. Dell has 4K monitors available also, 3 sizes.
Yeah, shipping in Jan.