Back in mid-July we brought you news of an updated version of the TrackID (music recognition) app that introduced a new UI. At the time, there was a very limited rollout, so the only way to update to that version was via the APK download link (this moved the build number to 4.0.B.1.0).
Well Sony finally released this new version via the Google Play Store, which updates the build number to 4.0.B.5.0. We have noticed no changes since the previous v4 build, which apart from new UI, includes the ability to sync searches across devices (using SEN or Facebook) and faster recognition speed.
Thanks Ben!