Did they change things up with the grenade load out?

Look in top right at 2:34

http://www.youtube.com/watch?v=FL5g0u0IJhk&feature=related

In this video grenade slots are in top left…

http://www.youtube.com/watch?v=lsfsUq2BctU

So does this mean they changed it up or are those slots for something else?

Someone please elaborate on this, it will help bunches.

THanks!