Beside the 70-200mm f/2.8 IS II & 24-70mm f/2.8 II, I can't think of any [non-niche] noteworthy lenses Canon has announced in the last three years.
70-300L 
I've seen a lot of people around here (and elsewhere) praise the 40mm f/2.8 STM as a great general-purpose lens. And it certainly has a noteworthy form-factor! 
IMHO, a 5th 7[0/5]-300mm f/4-5.6 lens is not noteworthy. OK, IQ is better, but not 70-200mm IS II ground breaking better.
As for the 40mm f/2.8 STM, if it wasn't STM, it would just drop in the crack between the 35mm f/2 and the 50mm f/1.8, which is why I think it's just another video lens.