They will move them to FRA, as far as I understand (like the BBJ from MUC) to add C-capacity on flights to JFK.
There is, by the way, also a rumour that Privatair might loose the contract for the Airbus corporate shuttle between XFW and TLS (operated with two A319-100).
Lufthansa will base three A340s at DUS from May 08 onwards, serving Newark, Chicago and Toronto.
Let the bloodshed begin, Northwest, Continental, Delta and LTU (currently serving the US from DUS and nearby CGN).