Kendrick Lamar & J. Cole Collaboration Dropping February 16?

During his 'Black Friday' swap with Kendrick Lamar yesterday, J. Cole teased that he was dropping something in February. He didn't make clear what he was putting out, but a new clue from Lamar's sister suggests it's a collaboration between Cole and Kendrick.

She let the cat out of the bag on Instagram, but quickly deleted it.  WatchLoud was able to get  a screenshot of her insider's reveal. The message says a collab drops February 16, but still is very vague. Is it one song? The long awaited album between the two? I'm guessing more information will pop up sooner than later.