According to Brandon Staggs, the “limitations of XCode and IB for Mac development” have led him to delay the release of SwordSearcher Mac till late 2006. He is basically planning to switch to REALBasic and work on a cross-platform environment. Check out his blog for more details.
Incidentally, the 4.7 version of SwordSearcher for Windows has just been released. It includes a number of bug fixes and an export function for user-created commentaries and books. More details here. The new CD-ROM edition also includes 2 more classic Bibles and 3 new commentaries.