OddDoc: "Gameplay of some early versions of Episode Two maps. No, I'm not going to say a word about where I got it. I'm just want to share it with community with only possible way at this moment.
0:00 - Intro (Alyx Fall version), original map is ep2_outland_01. Version of June 9 2006. 4:39 - Radiostation, original map is ep2_outland_06a. Version of September 12 2006. 9:27 - Prototype of the White Forest battle. Original map is proto_finale3. Version of spring 2006. One of the first official screenshots has been taken on this map.
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(Credit to Jackathan for his early august timeline) 8:16 PM - Last modified date of the files...