Anything I need to know before watching MI:4?

Don't follow @ Joe.

Mission Impossible 4 is a great pop-corn thriller. It will start ripples of anticipation and adventure in your stomach right from its beggining. There is a sky-scrapper sequence in which Tom Cruise is shown climbing the building from 100th floor (or more). That scene alone will make you thrill. Don't miss it.

And if possible watch it in theater (if it is still running) or with a big screen and a home theatre with plenty of surround sound and the drapes closed. (so that it would feel like sitting inside a theater).

And since you're about to watch the whole Mission Impossible series watch it in the order as follow : -

1) Mission Impossible Ghost Protocol

2) Mission Impossible 2

3) Mission Impossible 1

4) Mission Impossible 3 - the 3rd part unfortunately offered very less thrills, but it is still enjoyable. So watch it in the last from the series.

know not to get your hopes up