There is an update due to be released fairly soon, but it's not a major release, ie. it'll be v2.4.4 rather than v2.5
The main new thing is emulated support for the DX8 effects (or most of them) in the OSX version, primarily for their use in game soundtracks (MODs). There is also support for the BASS_UNICODE flag in the OSX version, for better BASS.Net/Mono compatibility. More generally, there is also support for "cart" and "ID3" chunks in WAV files.