Having a look at Lumia 1020 developer page shows it running on same CPU-GPU combo as other Lumia 9XX devices. Check the page link below.

Lumia 1020 page

The product page also goes live.

Product page link

Bits about the availability,

The Nokia Lumia 1020 will arrive first on U.S. shores exclusively with AT&T, with sales expected to start on July 26 at a price of USD 299.99 on a two-year contract. Pre-order begins 16th July.

The Nokia Lumia 1020 is then expected to arrive in China and key European markets this quarter. Nokia plans to ship an exclusive variant of the device with Telefonica to select European and Latin American markets. The Nokia Lumia 1020 will be available in yellow, white and black.

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