Considering how the trademark is almost certain to be filed soon, I just thought it'd be appropriate to share our trademark skillz amongst each other.
What you do to look for new Blizzard Trademarks, is the following:
#1 Visit: http://www.uspto.gov/ (The United States Patent and Trademark Office).
#2 Go to Trademarks -> Trademark Search in the drop down navigation menu at the top.
#3 Under 'Select A Search Option', click 'Basic Word Mark Search (New User)'.
#4 In the empty text field, enter 'Blizzard Entertainment'. In the 'Field' menu, select 'Owner Name and Address'. Click 'Submit Query'.
#5 Voila. Here you have a list of the latest Trademarks registered under the Blizzard Entertainment name. You can go into the old ones and see when they were filed in case you want to seek patterns. Hearthstone appeared just a few days ago, or was renewed, I'm not sure. Anyhow, once EXP 5 is approved, it will show up at the top.
At least this is how I do it. There might be other ways. Feel free to share if you know of any!
For the record, these are the trademark dates from the past. They all had 5 days between the date of registering and when the news hit.
The Burning Crusade
Filed on: May 3, 2005
Trademark hit the news on: Unknown, 2005
Wrath of the Lich King
Filed on: July 28, 2007
Trademark hit the news on: August 2, 2007
Filed on: June 26, 2009
Trademark hit the news on: July 1, 2009
Mists of Pandaria
Filed on: July 27, 2011
Trademark hit the news on: August 2, 2011