Remi has announced the release of the remi-php7 repo, available for Fedora ≥ 21 and Enterprise Linux ≥ 6.

Current version is PHP 7.0.0beta2 with about 25 extensions which are already compatible. This repository provides development versions which are not suitable for production usage. [...] As for other remi's repositories, it is disabled by default, so the update is an administrator choice.

This repository can be installed just like other similar remi repos via the "yum" command to add the repository to the list of available ones, then another to upgrade the PHP installation.