I think it is fair to say Boyce has the inside track at a spot though.
Dobson, Edelman, LaFell & Amendola are all locks due to various considerations (LaFell could potentially be cut but VERY unlikely).
That leaves 1-2 spots open. I think Boyce might get the benefit of a doubt over other guys but he has to earn it after camp starts. If they decide they want to keep 2 WRs he is VERY likely to make it. Boyce & Thompkins are probably well ahead of the rest of the crowd. I like Harrison but he has to show it and lacks experience which will hurt him.