Except he won't, since this has been brought up before. It's been there for a long time. With 2 minutes of crude searching I found these:
http://forum.supercell.net/showthrea...t=grass+rocket
(posted July 2013)
http://forum.supercell.net/showthrea...ighlight=grass
(posted November 2013)
and I'm sure I've heard about these even before that. Don't make such misleading titles, OP, because this definetly isn't the first time this is discovered or mentioned. Also, keep in mind that these have been here already before the Witch was released, and probably all the way from day 1. These could or could not be upcoming troops, but so far all the evidence suggests that so is not the case.