Probably not iPhone 6S, but it could be iPhone 7, because of European Union regulations.

http://www.geek.com/apple/apple-will-be-forced-to-use-micro-...

That is not going to happen. Apple licenses out the use of its connectors for docking stations and other accessory usage. If they just drop the lightening connector on the iphone this soon after implementing it, I dont think manufacturers of these accessories would very happy about that.

Why would Apple start giving a flying f about accessory manufacturers?

Apple has a long history of completely disregarding the needs or desires of accessory manufacturers, and only started the MFi program after years of categorically responding with cease-and-desist letters. The program is primarily in serving Apple's interests in a level of reliability in the accessory ecosystem; it's an absolutely insignificant revenue stream.

Is this really the case? They certainly seemed to stick with the 30 pin connector for far longer than they had any reason to other than the massive third party accessory/dock/speaker market.

Because they are the ones that support Apple's products and pay a license to do so. If you change standards every Monday morning then these manufacturer would have to retool their products which would no doubt cost them.

Unless the EU makes it happen