In all seriousness, this is probably a bug and some of it actually looks pretty ridiculous. When I first noticed it, I almost wondered if my paladin had actually shrunk because I had long ago adjusted to her Crest of the Sha'tar being amusingly small. It would be nice to have a shield that wasn't tiny like a bean, but an increase in size on everything in the game just doesn't seem intentional.
To give you a better idea of how much of an increase I mean, I've included a side by side comparison after the jump. I apologize for the difference in quality between the shots, I've forgotten how to change the format WoW screens are saved in. Hooray!
PTR is on the Left, Live servers are on the Right.
No, this is not the gear I normally wear. It is, however, the prettiest gear I have to wear. ...What? Stop looking at me like that!