Development for GD bbPress Toolbox Pro 4.0 is completed, and currently Alpha #3 version is available for testing. Stable release for 4.0 is coming on October 5 2015. Until then there will be at least one Beta and one Release Candidate release.
PHP7 is upcoming major version of PHP and as it stands now, it should be released on November 12 2015. Current Release Candidate versions are stable enough for testing and it is time to get ready for the fastest version of PHP ever.