I think it will be more of an in-house spending spree and possibly one big addition (Earl Thomas). The Cowboys tried to get Earl for a 3rd round pick early this season and then increased their offer to a 2nd round pick at the last minute. The trade didn't happen & as we all know Earl broke his leg and can be seen cursing and flipping off the Seahawks bench. He's from Texas, played college ball for Texas, and is not hiding the fact that he wants to be a Cowboy.
The Cowboys have a top flight defense and in my mind only have one weakness (Safety). Earl is a perennial all-pro [even at his age] and plays with intensity and heart (a perfect match for what we have).
The only way Earl ends up anywhere else is if his asking price is too high. It will be interesting to see how it pans out, we have a ton of big name free agents hitting the block next year, so the Cowboys have to be careful with how they spend money. The window to win in the NFL is too short, I don't believe they'll pass up an opportunity to sign Earl!