It is not our process to encourage downstream consumers to dip into pre-release code, source or binary. Although we work transparently, the pre-release code is intended for project participants to work with, not for the general public.
In fact we actively take steps to discourage general use pre-release. For example, we don't send out notes to general user lists advertising developer snapshot builds. We only advertise that on internal project lists.
Remember, we take pride in the full review we give to our releases. This is part of the Apache reputation, the Apache brand. I don't think we should dumb that down and publish to the public "Apache-lite" code that is only-partially reviewed, for the benefit consumers who are impatient to wait for the real release, but also unwilling to help us get there.