I think the most important change from last year to this year is our wide receivers coach. In my opinion, Brian Hartline is a quantum leap ahead of the fellow we had in that role previously. Our receivers now have had the benefit of a full season and off-season with him in charge.
Naturally, we're going to take a step back in raw speed after losing a couple of legit 4.3 guys to the NFL. But It's not like we have no speed at wide receiver this year. Olave looks very fast to me - and it's not just his route running. He couldn't play gunner on special teams that well if he didn't have great speed.
While I agree with some observations above - I disagree with others. Sure, Michael Thomas was not really a speed guy per se - but he is actually pretty fast for a receiver with his size, strength, hands and leaping ability. What you ideally want with a bigger, rangier guy at X is a speed guy at Z. Kind of what we have right now at least some of the time.
Plus, I believe we have some true, young speed burners who are barely in the rotation right now. Some have already mentioned Williams and Wilson, above. But, from everything I've heard/read, Gill is an incredibly fast player who is just waiting for his opportunity at H.
As far as speed not being important as a deep threat? A few Buckeyes I've watched over the years would like to have a word. Try telling that to Paul Warfield, Doug Donley, Terry Glenn, Joey Galloway, Ted Ginn, etc. -