I haven't seen this episode yet (It's on my DVR, I just haven't had the time), but I was actually wondering the other day how Lucas is going to pull this one off: Neither Rex nor Ahsoka appear in ROTS, so what happens to them? My guess is, since Lucas doesn't seem to care about canon or storylines or continuity. Look what happened to the Mandalorians, for example.
However, now I REALLY want to get caught up with these episodes!