Both BHS-T and HMT-W4 recently updated in my Accordance. I don't know if that has to do with the Westminster Hebrew Morphology or not, but I notice that there is a 4.18 now available through other Bible software.
I don't know what the differences amount to, but I'm wondering if 4.18 is expected in Accordance?
The most recent information I could find from the Groves Center is: "Version 4.16 will be released in the first half of 2012," but this appears to be an outdated page. I can't find any other information online about 4.18.