I maybe missing something but where are the jungles? and so for no mesa on my seed :"(
I have not seen a jungle or ice spike biome in any of the maps I have generated - and I have traveled in almost 20,000 blocks in all directions from initial spawn.
Frankly I don't miss the jungles at all - in terms of performance going through jungle in survival/creative almost always causes MC to crash - must be having to display the complicated chunks due to the trees and air. The roofed forest almost causes the same lag/slowness.
Having lots of issues with 1.7.2 -
First: No sounds when gathering anything.
Second, No popping sound when you pick up an items any longer.
Third: I get this every time I log into MC.
and all texts are gibberish in many places. http://i.imgur.com/GWomqRr.png
I have re-downloaded 3 times so far, and still the same.
I guess Mojang still has tons of work to do on this.
I'm not sure where all of these graphical or sound glitches are coming from but I just personally downloaded and booted up a new 1.7.2 world and I've yet to experience any of these bugs the previous few posters have pointed out.