Yes, its a bit like omega says.
I first walk through the map and make some spots very high or low on a random basis, then I smooth this.
You have several options to influance the behaviour:
1. you can do this on top of an already existing map or you reset the height before it starts
2. you can give minHeight and maxHeight for the peaks that are set in a first run
3. you can influance the chance that a peak is set
4. you can configuer the number of smooth recursions
All this gives very different results, play with it to see what happens ( its in git in development branch )
And yes I replaced the original randomize, because it was quite useless.
update: anyone tried it yet ? ( windows build is fixed too now )