You've seen the patch notes for Minecraft 1.6, now check out a trailer for the update coming this week. The trailer was put together by HAT Films and primarily focuses on the new map system, though it does show the tall grass being added as well.
"Do not turn this invitation down. It has been said that petting the tummy of a kitten is like frolicking in the back hair of an angle" - theoatmeal.com
If you ever start making ads for minecraft get the team that made these behind it. It was awesome.
I'm looking forward to hatches, despite not knowing what they are at all!