Apple has released MacBook Pro (Retina, 13-inch, Late 2013) Software Update 1.0, which affects only those who have purchased one of the just-released models (see “New Retina MacBook Pro Models Thinner, Lighter, and Cheaper,” 22 October 2013). However, as this update solely replaces the missing Simplified Chinese and Traditional Chinese OS X Software License Agreement with a fresh copy in your Documentation folder, you can probably skip this one, particularly if you’re not using either of these localizations. (Free, 5 MB)
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Constant Dictionary Definitions
If you hold down Command-Control-D in a Cocoa-based application that supports AppleSpell, you'll see little dictionary pop-ups for each word that you mouse over. Neat, eh?