I'm also a Charge HR user; I fixed mine with superglue. My dream scenario would be if this merger produced a Pebble 3 with the excellent heart-rate and sleep tracking of the HR.
Same dream here. But was going to be true since Pebble 2 has the HR sensor, and to make an accurate sleep tracker once you also have HR data does not sound like too hard. So I hope Fitbit is not going to ruin the dream.