They really liked the whole aristocracy angle for the series (something of a common re-occurence with Gundam ever since the Zabis).
Having finaly caught up with the manga version as far as the western release goes, i can appriciate them adding some extra parts for Yor, since her first big story might not make it this season (really looking forward to it in animated form though).
Also not to spoil too much, but there should be one more "filler" story before there is a longer plotline again.