Eagles beat writer Sheil Kapadia on the team's receiving roles:
One thing I know about Chip Kelly: He believes in making rookies earn playing time. So don't be surprised/alarmed if Nelson Agholor starts out with the second or third team. But given how advanced Agholor seems to be from a mental standpoint, he could be the exception.
Riley Cooper's role is one we probably haven't discussed enough here. There's a scenario where the Eagles settle on Jordan Matthews, Josh Huff and Agholor as the top three receivers, leaving Cooper on the sideline. ... But Huff will have to prove he's a more reliable option in his second year to earn those snaps.
As for Matthews' role, my guess is he plays a lot more outside in 2015. I didn't think his size was a huge advantage in the slot last year, even though he was highly productive in that role, and Agholor may be better suited to play inside as a rookie.
Matthews will have to play more than the 65% of the snaps that he played as a rookie. He was the #24 WR in standard formats, so increased playing time should lead to a better finish. We're more interested in just how much Agholor, Huff and Cooper will play.