Valve has been watching both the Eastern as well as the Western qualifiers and has acquired a few moves from The GD Studio's and BTS' playbooks. Casters will now be able to start polls through the client and pop-ups will now signal when heroes acquire high-end items.
Both the Western and Eastern qualifiers for The International 3 have showcased a new level of production value, as the hosts - The GD Studio and BeyondTheSummit - have been using poll features and lately a pop-up for when items were delivered. Valve takes away the work by now implementing such features into the game.
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GAMEPLAY
- Fixed illusions being able to upgrade to flying courier.UI
- Added a spectator popup when Heroes acquire high end items.
- Added a broadcaster menu (opened by clicking on the dota logo in the top right) that allows broadcasters to send generic stats, queries, and poll results to spectators.
- The Spectator Smooth Drag setting is now preserved across runs.
- Added notifications of item purchases in some cases.PERFORMANCE
- Fixed a crash when starting replays on 32-bit versions of Windows.
- Fixed a crash when changing window or screen resolution.
- Fixed a crash when using alt-tab while running full screen.WORKSHOP
- Added Itsy spider courier.AUDIO
- Update Drums on Endurance cast sound.
- Add secondary underscore for startup UI.
As for the ingame stats and texts, there are three options. Two of those include pictures/icons from both the heroes in the game as well as some generic icons, like a timer, a question mark or a Dota 2 icon.
Also check out wykrhm's blog for a more in-depth look on all the features.
In addition to these notes, The Defense 4 should have an in-game ticket as well.
Source: Dota2Dev Forum