"Something which caught my attention while reading this question was the requirement for a 32-bit operating system with newer software than Red Hat Enterprise Linux 6 offers. It seems unusual that someone would want new software versions, enterprise support and a 32-bit operating system. New software and legacy hardware (or new software and enterprise environments) rarely go together and it might be worth looking into whether these criteria are really necessary."While I certainly understand Jesse's point about 32-bit being legacy hardware, there are still many use cases where 32-bit and current enterprise quality software and OS are necessary. Many current Linux apps are still very light and can run very well on rather old hardware, both in the server room and on the desktop.
I've done a lot of support of government servers and they run for about forever, as in until they serve no further use. Even retired, old servers are often repurposed and put back into service due to budget restrictions and/or long lead times to order new equipment under the required procedures for government procurement. In the United States this is especially true at the state level. When a server is repurposed it is usually reloaded with the current enterprise standard Linux distrubution release and applications, not legacy releases. That's one common use case.
Non-profits and small businesses often get by with older equipment as well, and in the case of non-profits it may even be donated second hand equipment that was no longer useful in it's former commercial enterprise home. Once again, a 32-bit OS and current software makes sense in cases like this.
My personal hope is that the free enterprise Linux clones will take Red Hat's 64-bit sources and create a 32-bit version. It isn't hard to do but it is time consuming. CentOS has already made clear they will release a 32-bit build(see comment by developer Johnny Hughes below), which leaves Scientific Linux and Springdale Linux.
[Note: This article was expanded from my comments on DistroWatch Weekly, Issue 560.]