Too wide to embed, but here's the codeshare map they released today: http://content.delta.com/content/www/en ... 50093Z.pngUnless it's Virgin Atlantic metal replacing the DL 767-400, no. My guess is they might start other markets like Seattle or possibly Salt Lake City to London.
The Delta announcement just refers to the expanded options due to the joint venture, such as Dulles, Orlando, Miami, Las Vegas, and Chicago which can be ticketed as DL service to LHR.
EDIT: After a brief look, it appears that at least for now the only new routes are Manchester-LA and London-San Diego