The new landmark Disney Imagineers are planning for the sunshine plaza at the end of DCA's "mainstreet", to act more or less the same as the castle acts for Disneyland, is already featured and used at a different Disney theme park.
And you're guessing right, it's in the soon to be Disney's Hollywood Studios.
The Carthay Circle Theater is a store located on Sunset Boulevard, and it is actually the last building on the right before the Hollywoodland gate (Tower of Terror).
The one in Florida is actually a modified and scaled down version, yet unlike many other Hollywood inspired landmarks in the park, it is a very close replica and it also bears the name and signage of the source.
Obviusly the one in DCA will be in full scale and much more impressive, with special lighting and of course searchlights!
Werner Weiss, I guess you can now add it to the very nice comparison page you posted a week ago!