Left 4 Dead 3 and Source2 in changelog, does this mean its true???

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"If a photo of an internal Valve changelog list is anything to go by, well have a third installment of Left 4 Dead before we hear anything about that other Valve game with shooting from a first-person perspective. The image above was taken by a group of Dota 2 players lucky enough to tour Valves offices recently as part of the International 3 Dota 2 tournament. If you look closely, youll notice a reference to L4D3 as well as Source2, which appears to indicate that the game will use Valves long in development new engine".
"Of course, news that Valve is developing Source Engine 2 isnt new: Gabe Newell reportedly told a tour group last year that the studio had been working on new engine stuff for a while, and that they were just waiting for a game to roll it out with. Could Left 4 Dead 3 be it?"