That gameplay trailer was awesome. If the rounds are anything like that then it looks like we are in for an interesting and exciting game.
To be honest, the last Rainbow Six game I have played was for N64. I still remember planning the routes through the levels. I got so good at it eventually that I could just set the friendly computer players to go do the whole level for me. I hope they have something to this effect in this game. I am tired of linear FPS campaigns that never challenge you to think, plan, or do anything other than shoot 500 stupid computer guys. I never even finished the BF4 or COD Ghosts or AW campaigns.
I am looking forward to getting my "tactical" on in this game with some CAG members. I feel this game will draw a "mature" crowd and that is something that has been dwindling in recent years with the nature of current FPS games.