In short yardage I expect Taliaferro to be on the field. When Forsett needs a blow both Allen and Taliaferro will willing and able.
Pitta is just an unknown. No use even speculating as it is exactly 50/50, yes or no. So I look for Gilmore and Williams to get the TE snaps. If Pitta can contribute then fine and if not then that is fine also.
You can bank on Perriman and Smith to be #1 and #2 and not in that order necessarily but what does that matter. Perriman, just by his presence, changes what a defense can do. Hard to put 8 in the box with him on the field. In 3 and 4 WR sets I expect Brown and Waller to see the majority of snaps. Waller will exceed everyone's expectations. Trestman and Flacco can make this guy a star. There just are not too many guys that are 6'6, 240 lbs that can run a 4.4 40. He is athletic and contests very ball. Predraft comments stated he could be a "TD machine in the NFL" and "...back shoulder throws were nearly indefensible". Sounds a lot like Anquan Boldin when he was paired with Flacco. Flacco gets extra out of all his receivers due to his arm strength. He did this with Marlon in his rookie year. He didn't need Marlon much last year and probably won't this year either. But the guy is a very good receiver. We are just loaded at WR now.
By signing Lewis, Ozzie was basically throwing in the towel on Elam. Lewis was not signed for depth. If Elam blossoms great. My guess is that this is his last year as a Raven if he makes the team.
Kick returner is a good question. They won't take a chance on Webb if he is healthy and playing back to his old form at corner. If he's still weak at corner they might as well let him return. Jackson, Carter and Campanaro will all get solid looks as return men. Should be a good competition.
They will keep 9-10 O linemen. The rookie they drafted plus the 7 that played last year makes 8. This may be the year that Reid and/or Jensen gets cut. They had some nice UDFA's in camp.
On paper this is the best Ravens team as far as talent and depth is concerned. They will be a tough test for any team they face.