Here is the Motu Proprio we've been waiting for since (in my case) 1986. It's in Latin or in English here.
(Please note that I have edited this post to remove the link to the US Catholic Bishops Conference version of Summorum Pontificum. I've replaced it with a link to a text that seems to be a more accurate translation.)
Now I'm off to recite the Te Deum (because I sing very badly indeed). If you feel like joining me the words are linked here in Latin and English