As of now the following ports are available for OWB 10.2.0.4:
Linux x86-64 (AMD64/EM64T)
HP-UX PA-RISC (64-bit)
All of these can be downloaded from metalink (https://metalink.oracle.com/) under patch id 7005587. You will need to log into metalink to download the patch.
The following platforms will follow shortly:
AIX5L Based Systems (64-bit)
Vista-32 bit (and Windows2008-32, Windows2008-64)
More on those platforms once available.