@Maiasma From HotS patch notes:
Loot Chests
Loot Chests purchased via the Loot tab will now only grant Rare Loot Chests, rather than Normal Loot Chests.
Please note: This only applies to Loot Chests purchased after this patch is applied to the live version of the game in each region. Normal Loot Chests the player already owns will not convert to Rare Loot Chests.
Wah-wah.
@PaulFerence dang, rough timing on that. But now you can buy MORE gems and get a celestial raptor mount! :P