Around the time of the release of Drupal 8 there is a more significant, but subtle evolution taking over the web. This is HTTP/2, a new and improved version of the venerable protocol powering not only web sites and applications but a lot of infrastructure messaging for energy, industry and more.
The next big version of Drupal is launching on November 19th 2015. This also means that the end of line for Drupal 6 is set to February 24th 2015. After that date it will not receive any updates. Unlike some Linux distributions, like Redhat the system does not have a third party backer to backport fixes from Drupal 7 or 8 to version 6.
Drupal 8 is set to be released on November 19th 2015. It brings improvements to many aspects of the popular CMS, but the most significant ones remain hidden from user.
One of the core components that Drupal 8 adopted from the Symfony Project is the HttpKernel. This handled all incoming and outgoing HTTP traffic. In addition to the convenience and clarity, it also handles requests independently from each other.
Drupal 8 is a big change to the popular CMS. If you plan to get started with Drupal 8 development, you should understand that under the hood it's a very different beast from Drupal 6 and 7, versions that are still in use commonly.
Every technical article you read on previous versions needs to be read with a grain of salt. Luckily the basic concepts of the system (view, content types, modules and more) remain the same, so if you're just getting started with Drupal you're in luck. You're on the same starting point with many more experienced Drupal developer.
HTTP/2 is a new version of the popular protocol that is for communication between the web server and the browser. It is a lower level technology than Drupal, so taking HTTP/2 into use does not require any modifications to your application or installation of Drupal modules. Drupal 8 introduces the request-response model to Drupal developers, but on a higher level - this is not to be confused with HTTP/1.1 vs. HTTP/2.
Drupal 8 release date is November 19th 2015. That's the big day that thousands of people have been working toward. It'll be a major release - arguably the biggest change to Drupal itself in it's history. Read the details on the Drupal 8 launch article.
Along with Drupal 8 release there has been a lot of noise made about headless Drupal with the REST API. Headless Drupal maybe a great choice for data driven use (such as web applications or mobile apps), but for content driven applications (web sites) a pure headless implementation offers little improvement over more traditional site building methods.
The relationship of Drupal and Acquia is somewhat unclear to newcomers to Drupal. When they get into Drupal they're whole heartedly welcomed to the Open Source community known as Drupal. But the company Acquia keeps popping up when talks of Drupal and Business arise. Let's try to make this a bit more clear