The Windows Phone Blog has a nice writeup on the new features we will see in the Mango Music + Video Hub



From WPCentral:

We've known about some of the features for awhile now (see our "Big Mango consumer list" for what we know so far), but it's great to have official confirmation and more details. There are also quite a few smaller updates that don't merit their own bullet point, but will help smooth out the experience.

The on-device podcast support is a welcome feature, and many users have been asking for it since day one. The iPhone supports it out of the box, and there are a few apps in the Marketplace (e.g. Bring Cast and Podcasts!) that offer some podcast functionality, but so far, only Windows Phone has announced on-device podcast subscriptions, baked into the OS. The standard download-for-later, and stream-it-now options are supported, and users will be able to download or stream over WiFi or GSM/CDMA.

  Microsoft details music & video hub changes in Mango