I don't know if any beta exists on disc, but I figured someone here might know the answer to that.

http://www.youtube.com/watch?v=8SvHHO5ksNg
http://www.youtube.com/watch?v=fD79J...eature=related

These videos show the various changes that Mass Effect went through before it was released. Changes include:
-Shepard's face looks different, yet is still voiced by Mark Meer.
-Ashley wears Phoenix armor similar to the final one, but her face and voice is completely different.
-HUD is different, in both videos.
-Inventory menu looks better, in my opinion.
-Ability to control squad members in battle.
-Galaxy map looks a lot more bland/unpolished.
-New areas, but ones that exist in the final version don't look much different.

These are not all of the differences, just some of the ones I noticed at quick glance. Does anyone know anything about its possible existence?