The last update (today) said it's 4-6 weeks. for the iPhone 6 Plus.
Will it be possible cancel my order, placed on 9/13, by chatting or calling your customer service? Then I'd go ahead and order the iPhone 6 which is better supply, even though it's like 15 time more popular.
Hey I had that same issue but this is what you should do. Apple can now appl your plan with Sprint. I went into the apple store on a Tuesday morning at 945AM, they opened at 10AM in Milwaukee WI. I checked in as they get shipments Monday through Friday. I received my 6+ through Apple then went to the Sprint store and got my refund. Your order from Sprint will not show up in the system yet as it's on back order so you will have to go to an actual store to cancel out that order from Sprint.
I just tested my luck. I understand not everyone has the extra money laying around to just go purchase another phone but it worked out for me as I went to the spring store and got my refund right away after I received my apple 6+ through Apple.