Fresh speculation for Left 4 Dead 3 has surfaced online, this time by way of a leaked document on NeoGAF that reports to show slides of a Left 4 Dead 2 level rebuilt in Source Engine 2.0.
The map in question, the Plantation finale for the Swamp Fever campaign, shows a more detailed recreation of the map's ritzy architecture, as well as boosts to lighting, shadows, and foliage.
It's important to note that this prototype level, if real, could simply be a tech demonstration for the Source 2.0 engine, rather than evidence of a new Left 4 Dead title that will see updated campaigns from previous games.
Slides for the presentation boast that Source 2.0 will feature "redesigned tools & workflow," and a "powerful GUI front end for content authoring". The new engine "can be easily extended with custom and pre-game assets," features a "browser for quickly finding, managing, editing assets" and is also said to allow for "simple, automatic compiling of content."
Valve head honcho Gabe Newell said back in 2012 that the developer was working on its new Source 2.0 engine, and that Valve was just waiting for the right game to launch it with.
References to both Left 4 Dead 3 and Source 2.0 were spotted by fans last year during a tour round Valve's offices.