First of all, thanks for this update, Crowbar Collective.
It is something I personally have been waiting for years.
Said that, I am not really excited by the increase in size but rather by the fact that you guys decided to reinvent the only true weak part of the original game to deliver a better game under all possible aspects. Half Life Xen was, in my opinion, a real letdown and when you announced you were going to rework the level design, I was overjoyed.
I hope to read more about the core changes and I am hoping Xen will no longer be plagued by cheap deaths due to the jump sequences (which turned the game into a trampoline simulator).
Godspeed!