Is there a precompiled version of GIMP 2.7.2 available for MacOS X? Both official website and MacOS version website show only 2.6.x for MacOS.
They probably don't bother with unstable releases — as Gimp 2.7.x are just the unstable development snapshots towards 2.8. Gimp for Windows is also only available as 2.6.11.
As far as I know, development releases are only available in source code flavour.
You can obtain it through FTP. You can also take a look at its Git repository.