In an interview with GameSpot, PopCap producer Brian Lindley stated thatGarden Warfare won't have microtransactions "at launch," but noted that PopCap will watch in-game metrics and fan reaction to determine where to take the game next.
We can only guess as to what those plans may be, but hopefully they aren't comparable to the temporary "test" of charging to spawn new lawnmowers inPvZ2, as reported by GameSpot.