The Fedora Engineering and Steering Committee (FESCo) members met today and agreed to push out the release and all milestones up to that point by two weeks. The extra two weeks will allow for a mass rebuild of all F24 packages under GCC 6. With that said, GCC 6 was approved as the default compiler for Fedora 24 as expected. GCC 6 should be formally released around March while within the next few weeks the current development snapshot should arrive within Fedora 24 so that the rebuild can begin.
The delay will be stretched out to three weeks if the rebuilding of packages isn't done on time. Of course, Fedora 24 could still be prone to additional delays as they prepare the alpha, beta, and final release builds. Due to the delays already due to the mass rebuild, FESCo has requested a Fedora 25 schedule that would be for a late October release and no mass rebuild to take place then, since they'll still be on GCC 6.
FESCo also approved today the glibc locale sub-packaging, crypto policy support for Kerberos, deprecation of ipcalculator, and updating to the Darktable 2.0 RAW image application. Fedora 24 is shaping up to be an exciting release while now it doesn't look like it will officially debut until June. More details on today's FESCo decisions via the Fedora devel list.