The STATUS file says:
2.1.4 : in development
I was tagged as alpha. It sort of died, because of problems in apr-iconv. The Status file should be updated.
2.1.3 : Released on 2/22/2005 as alpha.
It had enough votes for beta, but I am not sure on the RM's decision. Either way, the Status file should be updated.
The ap_release.h header file says:
2.1.5-dev
This is correct. Look at:
http://svn.apache.org/repos/asf/httpd/httpd/tags/
Once Tagged, you should bump the ap_release.h to the next revision for /trunk/.