How many more trailers before release?

I doubt there will be any...they've kept this thing so super top secret, we're damn lucky we have the four that we do now....

I think there may be One more that's more of a 2-4 weeker.. But I may be wrong. We shall see

Any more info and "jones is out of the bag"

The only "new" footage before release will likely just be tv spots. After release they'll probably cook up a new trailer after the perverbial cat is out of the bag and will have some closing line like "the most talked about film this year, PROMETHEUS!"