Well, what did they have to loose anyway?
Dreamcatcher redefined themselves to get some success. Now CLC gets a new logo, official colors and most likely higher quality videos (because Cube is more successful nowadays and has way more money than the last years with more people investing in Cube).
If they really want to be more successful and recognized than in the past they need to change something to catch the public eye in Korea. Let's hope they will be really successful!
That said I didn't see it as being really sultry. It seems they are finally trying to tell the people what CLC's strength und unique characteristics are so that the group and its member appear distinguishable .