According to the video below, Jason Isaacs will not be the lead character in the show, even though he's Captain of the Discovery, he is part of the supporting cast.
The leading actor will be Sonnequa Martin-Green a Lieutenant Commander aboard the Discovery who will go by the title "number 1".
It's the first time a black female will lead the cast of a Star Trek series. She is known mostly for her role in the Walking Dead series.
The Star Trek Discovery series will be set 10 years before Kirk et al embark on their 5 year mission.
The Star Trek Enterprise series from about 2001 to 2005 was set about 100 years before Kirk's five year mission.
The first season involving one pilot episode and 12 follow up episodes will be serialized.
There will be no stand alone episodes that are neat and self contained like an egg.
In other words there will be one extended story arc where every episode is the lead in for the next like Battle Star Galactica was in the 2000's or like Game of Thrones is now.
That's a nice change in my opinion.
The series will likely start airing around September 2017, although that target is still if flux.