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both package are signed with wrong pgp key:
warning: a2ps-4.14-10.1.el6.x86_64.rpm: Header V3 RSA/SHA256 signature: NOKEY, key ID f21541eb
warning: a2ps-4.14-10.1.el6.i686.rpm: Header V3 RSA/SHA256 signature: NOKEY, key ID f21541eb

This issue has been proposed when we are only considering blocker
issues in the current Red Hat Enterprise Linux release.

** If you would still like this issue considered for the current
release, ask your support representative to file as a blocker on
your behalf. Otherwise ask that it be considered for the next
Red Hat Enterprise Linux release. **

the strange thing that it's the _only_ one package with wrong signature...

How did you encounter that error?  It looks to me like the package is fine and that you just need to install the RHEL 6 Beta key.

https://www.redhat.com/security/team/key/

ok i was fool:-(
the strange thing is that on rhel-5 (wher i didn't import the key) this command:
rpm -qp --qf '%{NAME} %{VERSION}-%{RELEASE} %{ARCH}\n' *.rpm
gives the error only for the first rpm and a2ps was the first one. 
sorry rpm made a joke.

Yup, that's RPM for 'ya.  :)

When RPM is doing a query and encounters a signature that it doesn't recognize,it reports, but only the first time it sees it in the query.