Overall, NHL 16 will be worth the money if you don't have a specific wish they miss out on (like editing players). If you'll be looking for a well rounded hockey simulation with all the gameplay modes you missed in NHL 15 and the actually very very good gameplay on the ice, NHL 16 will be a must buy.
They ****ed up NHL 15. Besides the gameplay, it's a joke of a full-price game (they lowered the price quite a lot relatively soon btw, if you get it for 30 bucks, go for it). NHL 16 though will be the exact game everyone wanted when NHL 15 was released. The only problem is: They are one year behind what you would expect.
Talking about NHL 16, the hate bashing around here is a little uncalled.
Unfortunately, this has an about 5% chance of happening over the next 5 years. Or in other words: Nope.