Fedora 17 is going to stick with the 10.X series, Fedora 16 is sticking with the 1.8.X series.
EPEL 6 will stick with the 1.8.X series for the time being as Digium designates is as a long term support release[1]. Digium plans on ending support for 1.8.X in 2015 while RHEL 6 support from Red Hat will continue until 2020[2] so at some point in 2015 Asterisk in EPEL 6 will need to switch to a newer version, probably version 13 if Digium's plans hold.
[1] https://wiki.asterisk.org/wiki/display/AST/Asterisk+Versions
[2] https://access.redhat.com/support/policy/updates/errata/
--
Jeff Ollie
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