Just like the usual fifteen, these bonus cards are random; you might get any one of them every time you rip a pack. Some of the bonus cards are informational "tips & tricks" cards that explain more about Magic. Some of them spill the beans on some of the combos available in the Tenth Edition set.
And still others are all-new token cards with original art by Magic's top artists. Each of these tokens is usable with one or more token-generating cards in the Tenth set.
Rip open a booster of Tenth, get some black-bordered goodness. Maybe open a tips & tricks card for your buddy who's just learning. And maybe crack a token card for yourself. Will you and your friend have a great time at Magic Game Day? The odds are excellent.