2016 NA LCS Rosters

Since season 6 is starting in a few weeks, I am wondering if there is a deadline for teams to announce their rosters? There are several new teams in NA and a lot of shuffling of players this pre-season. I have been trying to keep up so that I am ready for next season, but I feel like I am missing something. Is there an official place to learn about the roster updates or preview the teams? I am really pumped for next season, but since All-Stars I have felt a vacuum of E-sports and I am looking for something to hold me over for the next few weeks. Any direction or recommendations would be great.