Yep, it will be interesting to see. MI are probably the weakest of the three IPL teams on the basis of consistency. Their batting and bowling for the most part are one-man shows. The batting is especially weak should Tendulkar fail, because there's no one in that middle order who can bat under pressure - even Pollard gave away his wicket to a useless shot against the Lions. Also they suffer from Tendulkar's captaincy and his tendency to pull rabbits out of his hat that don't work.
Mumbai should work Dwayne Bravo into the lineup to add class, experience, and steel to the middle order. I don't rate Saurabh Tiwary much, so I don't care if he's replaced by another interchangeable domestic player. The game is at Durban, which means that all domestic players (with the possible exception of Shikhar Dhawan) should be easily dispatched with pacey short stuff aimed at the body. Since Tendulkar/team management has decided that Ryan McLaren is not good enough to bowl more than an over, it's a waste of a foreign player spot to keep playing him.
I loved the way the Redbacks went about their business against the Lions and I think they would be well-positioned for a win here. SA v RCB is probably the game that decides the winner in this weak group.