Sony Mobile has revamped the Podcast application (normally found within the Music app) by introducing a light theme to bring it in line with changes to its media apps. The Podcast build number has moved from 2.0.A.0.8 to version 2.1.A.0.10 and includes a lighter interface throughout the app. The other main change is that Sony has added a new widget, allowing you to access the Podcast app directly from the home screen. The 3.1MB update is currently rolling to most recent Sony Xperia devices.
Thanks Himath and Sasa!