The Fokker Dr. 1 and the Sopwith Camel, what many thought should have been included in Rise of Flight by default, are now coming in the upcoming patch 1.008! Neoqb's Lefty says the patch it due late October, which is essentially next week.
More details about 1.008 will be revealed when the patch is released.
In the meantime, feast your eyes on these new and truly amazing screenshots (click for higher quality). And if you're still not satiated, check out some of the old videos with the Camel and Dr. 1 from when the game was still in development (scroll to the bottom under "Related videos").