From the press release:

You’ve seen her in Young Allies, what’s the story behind the new Spider-Girl? Find out in Amazing Spider-Man #637, the next chapter of the sold-out, critically-acclaimed “Grim Hunt”! The red-hot team of Joe Kelly and Michael Lark has brought Spider-Man and his allies to their knees—but the birth of the Marvel Universe’s new Spider-Girl—in an all-new costume—may be what the heroes need to win! And once the dust settles, Spider-Girl will change Spider-Man’s world forever, in ways no fan can afford to miss!

Don’t miss the birth of the next great Marvel hero in Amazing Spider-Man #637!

Preview:

AMAZING SPIDER-MAN #637 (MAY100551)
Written by JOE KELLY, J.M DEMATTEIS & STAN LEE
Penciled by MICHAEL LARK, MAX FIUMARA & MARCOS MARTIN
Cover by OLIVIER COIPEL
Variant by MIKE FYLES
Rated A …$3.99
On-Sale—7/14/10

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1. A Preview of Amazing Spider-Man #634
2. Grim Hunt Sells Out and Return with Second Printings!
3. Marvel Unveils Olivier Coipel’s Amazing Spider-Man Cover
4. A Four-Page Preview of The Amazing Spider-Man #611
5. Your First Look at Amazing Spider-Man #638: ‘One Moment in Time’!