Wow...I'll tell you from using a Motorola i580 flip phone with the pull-up "wire" antenna, this one should allow you to get out or receive from under heavy brush or even in a canyon. Motorola's have pretty good antennas. Very nice design.
The X glass sounds good...I caught a rumor that Sapphire Glass was a possibility but I'm sure to cut costs, they'll stick with GG.
We'll know more one week from today (Thursday)