HLN is the US sister channel of CNN, previously known as Headline News and providing more condensed news updates. Recently, CNN has tried to reposition HLN as a network for a younger audience of "millenials". As part of this, the network recently introduced a new version of its logo.
The new logo is still based on a speech bubble, but the proportions have changed and the H-L ligature is gone. Presumably, the new logo will be better suited for integration with other graphics.
HLN's social media profiles were updated with the new logo in mid-December, but it didn't make its debut on screen until last week when HLN moved to a new set.
A video where the new set and logo is introduced: