Ureka v.1.5.2 includes IRAF 2.16.
IRAF is always compiled in 32-bit mode, even for the 64-bit binary distributions.
There are some differences between the version of IRAF bundled with Ureka and the one available from NOAO. The main IRAF tree is $UR_DIR/iraf, but there are additional packages in the common variant (in $UR_DIR/variants/common/iraf). These additional packages are configured in $UR_DIR/variants/common/extern.pkg, which is loaded by iraf/unix/hlib/extern.pkg.
Ureka also contains some programs for processing and visualizing data.