Just make sure you upload your save to cloud before deleting the game to make room so you don't lose it.
Edit: Bethesda's announced release dates for the Skyrim DLC, which is coming in reverse order:
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Quote:
Dragonborn confirmed for 2/12 release in N. America.
Hearthfire on 2/19.
Dawnguard on 2/26.
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https://twitter.com/BGS_Devs/status/297361461355892736