If you are an active subscriber of Star Wars The Old Republic and own Knights Of The Fallen Empire, you will receive one free level 60 character. This will only apply to a new character so you will unable to boost your current alt or main to level 60. That being said the development team has stated that they are looking at increasing the amount of characters per server by 2 (for subscribers) in order to accommodate the increase in new characters.
You will also be able to purchase the boost off the cartel market for an unspecified amount of cartel coins. This whole things brings up a lot of questions regarding story and other details but there has not been enough information released for us to know all of these answers. That being said the team is going to periodically release more information to us.
I have seen a few questions around how the “Start at Level 60” will work that comes with Fallen Empire. I want to start by saying that we will be releasing a blog when we get a bit closer to launch that describes all of the nitty gritty details and walks you through everything. But for now I wanted to cover a bit about how it works and address some of the things I have been seeing.As a subscriber, when you get Fallen Empire you will receive one free level 60 character. This character must be a new character, you cannot “boost” an existing character up to 60. Beyond that first one which is included free with KOTFE, you can purchase additional level 60 characters through the Cartel Market at any time. I know that this raised the question of character limits as well. In talking with the development team, the plan is to increase the subscriber maximum character limit per server by 2 for the Fallen Empire launch. Not confirmation it will happen, but it is definitely their goal!I know you still have many questions, such as how this impacts Class story, etc. We will be revealing all of these details down the line as we get closer to launch.
The post above comes from this post on the SWTOR forums. It will be interesting to see how this affects your story, what it will do for the other side stories on other planets, and what your character will do for gear.