I think the majority of the 53 man roster is pretty much set in stone which is a good sign for this team.
As other have mentioned:
RB - Davis is questionable, I think both Kelly and Colburn have more potential. I am not sure if the coaching staff are very high on Kelly which would give Colburn a chance. For me it is between Kelly and Colburn.
WR - No. 5 and 6 is very very open, anyone from JoJo, Hodge, Thomas, Nsimba and Bachman. I think Bachman could have a real chance but wouldn't be surprised by any 2 out of that 5. As others have pointed out recently, JoJo's return ability puts him at an advantage.
TE - Mundt probably is a slight favourite due to his familiarity but I do think the 3 rookies have more potential. Blanton could be a real find if he develops but Practice Squad is more likely for him. Again its 1 from 4 with Mundt probably the safe choice.
O-Line - I think the 8 mentioned are going to be there but Hitner would also fit in nicely especially if they go with 9. Probably another centre would be ideal but Blythe and Demby could back up Allan if need be. A FA Vet is also a possibility but I think they stick with what they have.
ILB - Not sure about Carraway and Howard, I think they will probably only go with 4 and Dakota Allan would probably have a slight edge over Carraway and Howard. Again, its tight so I wouldn't be surprised to see any of that 3.
Normally I would have gone with only 4 safeties but Scott is primarily a Special Teams asset, at first, so I would put him in the 53 as a Safety