Based on recent trends Canon will prob stick IS in there as long as it's not over $1000 I might be interested.
Hopefully it will be f/1.4 IS USM and around $700
I'd buy it without IS if it was just a 50 f/1.4 II - an updated version with better optics and ring USM for $500 ish.
Don't want a 50 f/2.8 STM
Also very curious about this 24-70 f/4L IS.