Lopez-Gallego is a director familiar with The Weinstein Company team as he directed "King Of The Hill" (not to be confused with the Steven Soderbergh film) which was released by Dimension Films (run by Bob Weinstein; see the trailer below). Caewood was originally going to also run the visual effects work through his own company, but with time constraints a factor, Bekmambetov will utilize his Moscow-based team to take care of that work.
The plot remains under lock and key but Apollo 18 was a moon mission from the early ‘70s that was officially canceled by NASA, but according to urban legend, it actually happened. So you can probably guess where this is headed. It might seem a little strange to change up directors so late in the game, but considering this has all the marks of a super cheap production that will turn a profit even if only twenty people show up on opening day, The Weinstein Company probably aren't sweating it too much. "Apollo 18" will hit theaters on March 4, 2011. Keep watching the skies.