I wouldn't be surprised if they hold them back a week or two.
Just because a new Item Shop item is added to the game, doesn't mean it automatically appears in the Item Shop.
Although, holding back the refining jewels seems like the stupidest thing ever to me. If I recall correctly, when levels increased past 50, 60, 70 and 80, the newest jewels were added instantly.
If I recall correctly, when the level cap increased from 60 to 62, the newest jewels were added about a month later. I think that was around June to July of 2011. I do not remember about the jewels when the level cap increades from 70 to 72. Usually the majority of the off-level gear in not an improvement, but there are a few exceptions based on class combinations.