An interesting detail, but I think that's all it is.
It does make me note something positive, though: for all of Civ V's flaws, at least the numbering makes sense (as opposed to Maxis's 1, 2000, 3000, 4, 1; or Square's 1, 2, 3, 2, 6, 3, etc.; or Capcom's 1, 2, 2, 2, 2, 2, 2, 2, oh I give up)...