Boris,
I processed your registration/payment yesterday as I was out of town Wed-Saturday and didn't get mail delivery until Monday. You will probably receive your map tomorrow.
Here is the information from the Registration page regarding the Preview Map:
"Preview Maps: The map for the US Championships will be a new map by Mark Dominie, expanding the map considerably, including an update of the area around the lake. A download-able PDF of the existing map of the lowland area around the lake is available at the bottom of the
Locations page. If you would like to receive a printed copy of the old map by mail, check this box and enclose $1.00 (US addresses only)."
Note that there is a clip from the newly mapped area at the bottom of the A-meet home page.