Makes perfect sense, especially for 6D users, a cheap ultrawide that's great, Canon 17-40f4L seems now obsolete, anyway it already was after release of 16-35f4 IS.
Wonder how much would this one retail, maybe 500$ ?
I am wondering since 80D and 7D mkii are selling quite well, what is Canon waiting to launch EFS17-55f2.8 MKII or better maybe a 15-50f2.8
Obviously 50mmf1.4 needs replacement, it's the only lens in their current lineup that doesn't transmit focus distance to the camera