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Middle Linebacker Depth
This section is entirely contingent on whether or not the Ravens re-sign Dannell Ellerbe. If they resign him, both he and Jameel McClain should be solid starters at middle linebacker. If he doesn't return, though, the Ravens will have almost no depth at the position.
Either way, there is need at this position. Many mock drafts have the Ravens grabbing a middle linebacker in the first round, so if that prediction manifests, their draft pick could possibly challenge for a starting spot. The Ravens do need depth at middle linebacker, though, and if there's a cheap free agent who fits the bill, it's a good bet that they'll go for him.
Free Safety Depth
Like with middle linebacker, this position is contingent on what happens in free agency. Ed Reed is very unpredictable, and the fact that he serves as his own agent makes it a pretty big mystery as to what will happen with him.
Could Sean Considine or Omar Brown start at free safety if Reed leaves? It's not really something you want to find out. If Reed goes, the Ravens will have to be active in searching for a new starting safety.
Starting Defensive Tackle
The Ravens were ranked 20th in rush defense, largely because of poor efforts from the defensive tackle position. Terrence Cody has at this point in his career played like a bust. He doesn't deserve a starting role, although at the same time it's difficult to think that the aging Ma'ake Kemoeatu has a lot to offer as a starter, either.
This results in the Ravens really needing a new defensive tackle. After their key free agents are resigned, expect them to go for someone who can help out in this area.