The HHVM project (an alternative PHP runtime from Facebook) has made a major announcement on their blog - beginning with version 3.24 they'll no longer be trying to keep parity with the PHP language now that it has moved into PHP 7.

The HHVM team is happy about the direction PHP has taken with PHP7, and we’re proud of the role we’ve played in pushing the language and runtime to where they are today. Since the PHP community is finally saying goodbye to PHP5, we’ve decided to do so as well.

Our next LTS release, 3.24, will be cut about four months from now and will receive support for one year thereafter. It will also be the last HHVM release that commits to PHP5 support. This aligns with PHP’s own timeline of sunsetting PHP5 at the end of 2018.

[...] PHP7 is charting a new course away from PHP5, and we want to do the same, via a renewed focus on Hack. Consequently, HHVM will not aim to target PHP7. The HHVM team believes that we have a clear path toward making Hack a fantastic language for web development, untethered from its PHP origins. We’d do ourselves and our users a disservice by positioning HHVM as an uncommon, less well-documented, less compatible PHP7 runtime.

The post then lists out some of their goals for the HHVM/Hack projects moving forward including reinvesting in open source and staying focused on their needs for the platform and language. It then talks about some of the upcoming changes you can expect around support of current versions of popular PHP tools and work on tools created specifically for Hack.