[DragonByte Tech]

5.2.0had this in it:

Revamped Thread / Reply Notices:

Do you have a massive board with 100+ forums? With the revamped New Thread / Reply Notices page, you can edit exactly what forums show what notices in what instance all from one page.

Downloadable Shoutbox Archives: You and your shoutbox admins can download a complete dump of the Shoutbox' archive for all instances. With 3 supported formats (tab-delimited CSV, XML and TXT), there's something for everyone whether your purpose is review or programming.

Easy Shoutbox Notice Editing: You and usergroups with the "Can Set Sticky" permission can now edit the notice by double-clicking the Sticky in the shoutbox. Quickly fix typos or rapidly update with new turn of events, editing it is never more than two clicks away.

Shoutbox Report System: Members can now report offensive shouts by using the shout context menu. When a report has been submitted, those with the "Can Moderate Chat" permission will see how many reports need their attention via a new chat tab in the Shoutbox.

Easy User Infractions: The context menu also adds a quick link to infract users, for those who can access vBulletin's infraction system. This lets you quickly punish members who are overstepping your bounds.

5.2.1 was just various bugfixes like the update email said