Yes and no.
They differ in size, and some cases are affected. Especially exact or tight fitting cases will never work, but a lot of TPU cases will. Most cases sold are generally exact fitting type cases.
The one I had for my 6 works on my 6S however my otterbox one does not and waiting on my new one.
A friend of mine was able to put my Otterbox Defender (6 plus) on her 6s Plus with no problems. Also was able to get the Apple leather case I have on it with no problems. So in general the answer is yes.
You've got a very nice device on the way, and it should be protected. I did a comparison of the cases we offer on the iPhone 6Plus and the iPhone 6S Plus. Great news, yes the cases are compatible. Enjoy your new phone!
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The Defender for the iPhone 6 Plus. Everything fits perfectly. She just wanted to try it out to make sure and we checked to make sure there were no parts of the plastic shell that didn't click together but all did.
Also noticed that some of the Defender boxes in store say for iPhone 6 Plus/6s plus...so it seems like they are saying the are the same size