We have official confirmation from IDW, the comics publisher handling both the Star Trek series and the Doctor Who series.
There will be a Next Gen/Doctor Who crossover.
Here's the cover....
There have been sort of crossovers (official crossovers, we're leaving the USENET/ficcers/shippers out of this). There was the X-Men/Old Trek and the Legion Of Superheroes/New Trek crossovers that are obviously not considered canon. Who has only had one crossover, with the TV show Eastenders for a charity short that was derided by critics (give 'em a break, they can't all be Curse Of Fatal Death, you know). But this is the first time two of the granddaddies of sci-fi/fantasy have intersected.
"'How's it going to end?' I've been wondering that myself."