Here's what you're going to see:
1. Another EF-S 18-135/3.5-5.6 IS consumer-grade zoom.
2. And another EF-S 70-300/4.5-5.6 IS zoom.
3. Some sort of insanely expensive, slow aperture EF wide- to normal non-L prime with added IS, priced around $700-900, like an EF 50/2 IS STM for $800.
4. An incremental update to some already well-regarded L lens that nobody really needs to have updated and even fewer people can actually afford, like the EF 200/2L IS...at 150% of the price.
5. Maybe we'll get a new EF 135/2L II, no IS, for $1800.
6. EF 24-70/2.8L IS, weighing in around 3.5 pounds and costing $3500, just to p*ss off all the people who bought the 24-70/2.8L II.
7. A completely new but also completely redundant design, like a 35-135/4L IS zoom.
8. A 400/5.6L IS...for $3000.
Or any one of those could be replaced by a new 100-400/4.5-5.6L IS II that is priced at absurd levels, say $4200.
Yeah, I'm definitely exaggerating, and sort of joking...but to be honest, I do NOT see Canon moving toward meeting the demands of fast aperture prime users. They are ALL about the zooms, and they are all about slow aperture designs that have looser tolerances that they can slap IS units on, and mark up at 1.5-2x the cost. Their thinking is that photographers don't need fast apertures anymore--after all, aren't the sensors good enough? (And no, they aren't.) When was the last time you saw ANY f/1.8 or faster design announced for production?
You know what I want to see them do? I want to see them bring back the 50/1.0L. Remind the world why the EF mount was made to be what it is. I want to see them push the envelope and see what could be done with today's manufacturing techniques and materials. You know your stuff is outdated when even a company like Sigma can beat your 35/1.4L for bokeh quality, corner sharpness, and secondary spectrum control. Then design an affordable series of lenses with emphasis on durability, like a 50/1.4 II, or a simple 50/1.8 that isn't plastic.
Canon used to be the undisputed leader of designing novel AF lenses. This is the company that gave us the TS-E 17/4L, 50/1.0L, 85/1.2L, MP-E 65/2.8, 135/2L, 200/1.8L, and 400/4L DO IS, among other amazing technologies. But all we see these days are uninspiring, conservative, incremental designs. Nothing that pushes the envelope, nothing that makes us feel like we just *have* to try this lens because it will let us get the shot that no other lens can.