#WKKB Meaning in Baahubali

In Baahubali - The Conclusion's poster and trailer, you can see #WKKB written there. While in the posters it's written in the corner, in the trailer it finds almost the centre with the release date close to the end of trailer.

WKKB is nothing but the biggest question: Why did Katappa kill Baahubali? So they are promoting 'Baahubali - The Conclusion' or 'Baahubali 2' (the number 2 is in the background of the name everywhere as 'Why Katappa Killed Bahubali' or WKKB. For the ease of Twitter and Facebook hash-tagging of course, it becomes #WKKB.