Do they increase level cap each month? Also, a question about end game

I'm going to end up hitting level 200 sometime this week, and will probably have all my medals to 6*. Was wondering if next month when/if they add more missions, will our level cap go up? Is it going to be equal to the amount of missions we have?

And for end game: Once we reach 200 and have all our 6* medals, that's it till more quests come in right?