I guarantee canon will give the 70-200 f4 is the 24-70 f4 is treatment, shorter, smaller, and perhaps even sharper than the 2.8 is ii, just a thought.
I really think canon was smart with discontinuing it, I loved it, but the justification between this and the is ii, was the sharpness, and if someone didn't want to pay for the is ii, they'd be happy with the tamron or sigma.
R.I.P.
Canon 70-200 f2.8