There is no new height limit, no new caves, no amethyst geodes <(i think) and no new mountians.

The height limit is still 255 - 0 in stead of 320 —64. There are no new caves and no geodes, basically no new generation, at all other than ores and deepslate. There are no new mountains and no powdered snow. I am not sure if this is  a glitch or these are coming in the holiday release later in the year.