You play the card just like you would playing it from your hand. [D'Angelo 2007/07/19]
If an effect has you draw multiple cards, reveal each one before you draw it. [Future Sight FAQ 2007/05/01]
If the top card is a land, you can play it if you could play a land. If it is a non-land, you can play it if you can play that spell. [Future Sight FAQ 2007/05/01]
If the top card has Morph, you can play it using the Morph ability. [Future Sight FAQ 2007/05/01]
When you play the top card, reveal the next card as soon as you are done putting the spell on the stack or the land into play. [Future Sight FAQ 2007/05/01]
If the top card of your library changes while in the middle of playing a spell or ability, don't reveal until you're done putting it on the stack. [Future Sight FAQ 2007/05/01]
You cannot suspend, cycle, discard, or play any activated abilities of such cards that are played while in your hand. [Future Sight FAQ 2007/05/01]