I am in northeast of China. Maybe there are different ways to use "将" in the different places. We will use "将" in written, formal occasions or speaking to the elders who you don't know well about each other. eg: 1. 明天将更加美好。Tomorrow will be better. 2. 出席本次会议的将有以下领导。These people will attend the conference. 3. 您将要去北京么？Are you going to Beijing? In oral Chinese, we use 要 in the future tense. eg: 我要去买东西。I will go shopping.

将is used in the future tense, and it's used not only in formal ossication. it can be used in unformal situation 2 for example:我将要去日本（i'm going to japan） anyway, hope it can help u

when you use 将，that mean you know something would happen,it same as "gonna".