I certainly don't see packages in either dev.centos.org or centos.karan.org which is the places that I would check for something like this.
These packages have been requested a few times, but it's more an implementation issue than anything else. apache has a fair amount of stuff built against it, and it would require rebuilding all of those packages, which will then not work with the current apache.
The end result is you'd have httpd-2.0.52-x, and httpd-2.2-x, which would each have their own php builds, mod_perl builds, mod_auth-foo builds etc. It basically causes several packages to be built twice to accomodate one package, and it's been an effort vs demand thing.
Apache 2.2 rpm's for CentOS 4 (or RHEL 4) would seem to be something of interest to more than just you.
If more people are interested and pipe up, then it may be that the demand is enough to warrant a separate build for this. So far that hasn't been the case. Suggestions and support are always welcome.