If Canon was to release a RF-S 15-60/2.8 lens, it would be Canon's first interesting RF-S lens for me.
I don't do video, and don't care about powerzoom option. But definitely sounds like a perfect replacement for my EF-S 17-55/2.8.
I would probably miss something in the long end if making it my standard walk-around lens instead of the EF-S 15-85mm. But it has the important 15mm in the short end, so if weight of an RF-S 15-60mm/2.8 was closer to the EF-S 15-85mm than to the 17-55mm/2.8 (which I hope is realistic with the shorter flange distance of a mirrorless lens?), it might still be considered for that too.
Oh well. I'm thinking to much about it. It is still only a "random" lens-patent coupled with a not so specific rumour