Announced at Pro Tour Gatecrash, The newest From the Vault boxed set will feature 20 cards (instead of the usual 15) to commemorate the 20 years since Magic's inception. Each card will be a selection from a "winning deck" from each of those years. It will be released on August 23, 2013 at $39.99 MSRP.
For reference, remember that none of the cards reprinted can be among those on the Reserved List.
The art for one of the as-yet-unknown cards has been spoiled:
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