The 3 good seeds I had for TU7/8 generate horribly in TU9. Villages are half formed or completely gone. The best mountains formations are likewise half missing. The beaches aren't additions to the coastlines but replace existing areas and aren't an improvement.|
And the new gravel texture is vile.
If you can defeat the enderdragon it drops enough xp for 77 levels or so. I only did it in creative mode so far to test it out, looks like quite the challenging fight given you have to destroy these healing-crystal things before the dragon is vulnerable.
Other than that, some new blocks, and a bunch of new bugs. Apparently people with Silver accounts can't start their saved games, either old or new ones, unless they disconnect the Xbox from the Internet altogether! I haven't tried opening up my old worlds yet to see what's changed.