The Fedora Change to retire the synaptics driver was approved by FESCO. This will apply to Fedora 26 and is part of a cleanup to, ironically, make the synaptics driver easier to install.
Since Fedora 22, xorg-x11-drv-libinput is the preferred input driver. For historical reasons, almost all users have the xorg-x11-drv-synaptics package installed. But to actually use the synaptics driver over xorg-x11-drv-libinput requires a manually dropped xorg.conf.d snippet. And that's just not ideal. Unfortunately, in DNF/RPM we cannot just say "replace the xorg-x11-drv-synaptics package with xorg-x11-drv-libinput on update but still allow users to install xorg-x11-drv-synaptics after that".
So the path taken is a package rename. Starting with Fedora 26, xorg-x11-drv-libinput's RPM will Provide/Obsolete  xorg-x11-drv-synaptics and thus remove the old package on update. Users that need the synaptics driver then need to install xorg-x11-drv-synaptics-legacy. This driver will then install itself correctly without extra user intervention and will take precedence over the libinput driver. Removing xorg-x11-drv-synaptics-legacy will remove the driver assignment and thus fall back to libinput for touchpads. So aside from the name change, everything else works smoother now. Both packages are now updated in Rawhide and should be available from your local mirror soon.
What does this mean for you as a user? If you are a synaptics user, after an update/install, you need to now manually install xorg-x11-drv-synaptics-legacy. You can remove any xorg.conf.d snippets assigning the synaptics driver unless they also include other custom configuration.
 "Provide" in RPM-speak means the package provides functionality otherwise provided by some other package even though it may not necessarily provide the code from that package. "Obsolete" means that installing this package replaces the obsoleted package.