Can I get a new iPhone at AT&T if my 2 year plan isn't over yet? (Over in 1 year)?

I have the 2 year plan at AT&T. I currently own the iPhone 5s and I received it about a year ago. In December, IIm thinking about purchasing the iPhone 6s plus. It won't be 2 years in December but I thought that it would be possible to get an update early because they re getting more money. Right? (I would turn in my current phone) I would pay for the phone not hope to get it for free.

You can if you pay full retail price like $700 usd you signed a two year contract, right.

AT&T doesn't want your old used iPhone, you would have to pay a ETF of like $400 - $450 to end your current contract, you did read the contract, right.