From what I have read, it looks like the six guys most likely to be in the two deep for LB are: Koa Farmer, Cam Brown, Jan Johnson, Jesse Luketa, Micah Parsons, and Manny Bowen. Manny is definitely not starting week one, and who knows when he's officially out of the doghouse but I think the two deep for week one is:

Will: Cam Brown, Micah Parsons

Mike: Jan Johnson, Manny Bowen

Sam: Koa Farmer, Jessie Luketa

This is just my guess, and Bowen / Luketa could swap places too but I think that's pretty close to what the LBs will look like Week 1. By no means do I think it will look like this through the year though, and I believe the 2nd string will get a lot of work in the first few games.