Well, it's about time...and space, apparently.
Rich Johnston's Bleeding Cool announced that one of science-fiction fandom's most-desired property crossovers is actually happening in a comic book mini-series from IDW Publishing. Johnston reports that in May, IDW will release a Doctor Who/Star Trek: The Next Generation crossover series featuring Matt Smith's Eleventh Doctor, along with Amy and Rory Pond/Williams meeting the crew of the U.S.S. Enterprise-D.
No details about who will be the series writer or artist, although Bleeding Cool provided the artwork shown here that appears to be from IDW cover artist Joe Corroney. IDW is scheduled to attend the 2012 Gallifrey One convention and will most likely make an official announcement of the series then.
Also, there are no details yet of the actual story premise, but a combined threat of the Cybermen and the Borg seems like a natural enough idea, doesn't it?
** Update as of 2/13/12 **
According to a follow-up article posted today on Bleeding Cool, the mini-series will indeed feature the Cybermen and the Borg and will be titled Assimilation. It will be written by Scott and David Tipton, writers of several Star Trek comics for IDW and will be drawn by Fallen Angel artist J.K. Woodward.