Musical love-story is a lost genre in BW, the team is promising I hope they deliver. Kiara needs to do something about her blandness though, I mean Kartik's expression in poster itself is eye-catching.
I don't know why Bollywood abandoned it. Everyone loves a good love story. It's a genre that has always done well for decades. And it's easier to get right than the genres that are in trend these days where you need a very specific formula to make it work. A musical romance is way more flexible in structure and you can do so much more with it.