Call them up and find out for sure but since you are using points for the upgrade, they should upgrade you two levels to whatever room type that is. If it's a suite, then you will get one king bed only. Unless you ask for the rollaway bed, I don't think they will put one in. There is a sofabed in the suite also.
I'm not sure what your odds are on landing a suite (since you are also Platinum status), but you should get a better chance if you opt for the higher rooms (maybe city view). It definitely doesn't hurt to call them up and see if you can get them to give you that extra "bump" up.