Dive summary: 

• A recent tweet from Twitter CEO Dick Costolo included a video clip, that auto plays and loops, hinting that the feature would soon be available. 
• In the fall, Twitter acquired Vine, makers of a video app, but the company has mentioned little since the acquisition. 
• Twitter still remains mum on the subject.

From the article: 

“According to sources familiar with the service,” reports the Financial Review, “Vine will offer six-second videos that can be integrated with tweets.”