Updated models with AMD graphics options expected in early 2017.
Apple's Online Order Status Pages Down Until Sunday's Retail Meeting
Apple is upgrading its online order status pages this weekend. The above message is displayed if you try to access your Order Status from Apple's Online Apple Store (thanks Jordan and Kris). The downtime corresponds to Apple's May 22nd retail event.
While there were some high hopes about the event, the latest rumors suggest that the event corresponds to many Apple Retail changes and improvements such as a revamped concierge system and other internal systems. The online order status must be tied into the upgrades.