Nah, the 1st will probably be used on a defender. Plus, I think 24th overall may not do it anyway (I can see a team slightly earlier doing it if the Lions are interested in just a 1st).
We see this often though - all these trade talks that amount to nothing. Some amount to something like the Bailey/Portis rumors and the Moss to Raiders rumors, but they're often fluff with no basis. I think Roy Williams being traded is a pretty 'fluff' trade that won't end up happening. Even if it does happen, I think Detroit would prefer a player anyway. That defense could really use a proven vet like Jason Taylor etc.
Now, Shaun Rogers on the other hand......