In an intriguing turn of events, a leak of Left 4 Dead 3's existence seems to have sprung directly from the source: Valve's Bellevue-based offices.

A keen-eyed Dota 2 player, touring the offices as part of The International 3 tournament, took a snap of an internal changelog that apparently lists both Left 4 Dead 3 and Source 2 as current projects. The below photo compliments a similar 'leak' via internal Valve documentation in June, although we have not verified the validity of either.

While co-founder Gabe Newell has been open (but unspecific) about Valve's work on a next-gen game engine , development on Left 4 Dead 3 has yet to be confirmed.For those holding a magnifying glass up to the screen, we'll save you the effort: there's no mention of Half-Life 3.via NeoGAF. Lucy O'Brien is Entertainment Editor at IGN AU. Follow her ramblings on IGN at Luce_IGN_AU ,or @Luceobrien on Twitter.