In Beta, Possibly: "Where is Gordon Freeman...?"
"Where is Gordon Freeman when you need to break something?"
In beta, possibly. In the link given by Mr Flibble, https://steamdb.info/blog/recent-caching-issues-on-steam/ , we read the following entry in the comments:
"A month ago or so HL3's existence on steam in beta was leaked https://steamdb.info/sub/66300/ " (but there is a following comment disputing its authenticity.)