what will stay the same?
the main idea of the game, the game play loop, your in the woods having to watch your hack for the monster, the monster is scared of light.

what will change?
it's hard to say at this point, but the graphics will most likely be made to look more realistic, the A.I script will be made better (using noise for it's path finding etc). there will be sound improvements, the story will be more fleshed out (also the story is having a entire rewrite).

there will be 3 endings instead of 1 in the final release (note: this is subject to change).