If the Big Chopper does begin to get serious attention on both sides of the Atlantic, the Europrop consortium has a suitably high-powered engine now in flight test on the A400M. Going by the Mi-26's use of the Bear's 10 - 11000 BHP engine, the Europrop power unit, suitably amended, would seem to be in with a chance, specially as P&W's (indirectly, through MTU) somewhere in the mix, and nobody else outside Russia has an engine like it.
'Ere's 'opin', innit?