The following pair of slides highlight the enhanced lighting and detail shots from a distance, showing the significant improvement in detail over the old Source engine. However, the other slides we can see discuss the improved technical improvements of the Source 2 engine. Unfortunately, 13 of these slides remain obscured from view, so we're not entirely sure what they may be discussing. While this slide alone is very interesting, the presentation actually features a total of 20 slides. The first slide, shown above, features an updated version of the the Plantation level from Left 4 Dead 2 and highlights the significant increase in detail possible on the Source 2 engine, with noticeably enhanced foliage, large amounts of high quality destruction, and improved lighting and shadow effects.

While we regularly don't post about idle speculation or rumours, CBOAT is well known for leaking confidential information to the public, and we believe it is very possible this presentation and the screenshots contained within it are official and are worth consideration. Neogaf user 'CBOAT' (crazy buttocks on a train) recently posted a thread highlighting a confidential PowerPoint presentation from Valve showing off the company's next-gen Source 2 engine using an updated Left 4 Dead 2 prototype.

Left 4 dead 2 source 2