As per http://fedoraproject.org/wiki/Releases/9/Schedule the alpha freeze is the 15th. This is a non-blocking freeze, as in we won't be freezing rawhide. Instead releng will be taking a snapshot (in koji) of rawhide and using this as the basis for the Alpha release. We will tag things for this snapshot at our discretion in coordination with QA. Maintainers can also request things be tagged via rel-eng@fedoraproject.org
Now would be a great time to either land changes you want exposure to, or fix up those broken deps/upgrade paths/etc...