Good question - it's taking a long time to appear. I'm also curious as to precisely what it is that's causing the delay. The compilers that those guys use will build perl-5.14.0 from source without any issues at all (afaik), so I'm thinking that perhaps they've struck issues with some of the extra (non-core) modules that they want to ship with their distro ... or some issues with the relocatability of their distro ... but I don't know.
If you really want a perl-5.14, you could of course install ActivePerl, even if only as an interim measure until Strawberry 5.14 arrives. Or you could use the compiler (and dmake) that shipped with your current version of Strawberry to build 5.14 from source.