When we talk of the Wankhede stadium, the previous match of Punjab was completely different with today's match. The scoring rate were at the peak for both the teams, and served to be a batting pitch. Today the ground was supportive for bowlers, both the teams have lost wickets and the average score isn't reached.
I would be surprised if they use the same pitch again as they really does not care about giving the bowlers a fair pitch or a longer boundary and they do not want to risk the viewership, may be the other pitch in the ground is prepared for Mumbai Indians to play their next game as they already have good bowlers and they do not need the pitch assistance to trouble the opposition and so is the reason they used this pitch in this game 
. There is no home advantage for any franchise this year so MI is not going to play any game in Wankhede.