I think for the first time in Wenger's long career with arsenal that they actually started signing top WC players (started last season with Ozil) instead of young players who they get for cheap and hope to be class one day.
Personally I think Arsene Wenger knows that he's getting to the end of his career with Arsenal and he wants to actually win something with them (won last season the cup). I guess he doesn't want to be remembered as the guy who created the arsenal brand (playing cool football) yet did not win much with them.