They aren't weaker. You are just seeing the 710 itemization with those wowhead links instead of the 740 itemizations they will actually have in PVP (I know at least I am used to seeing the 730 stats on PVP items so these do look weaker at first glance). I just cross checked them with the current tier and they definitely have higher stats on the 710 baseline items than the 700 baseline ones and will be 10 ilvl higher in pvp scenario as well (740 vs. 730).