I had forgotten all about it but recently I spent some time in STV and found one of these new chests and inside of it was Amy's Blanket a lv 20-30 something (i forget) blue.
Now I went running around Winterspring after I realized this, looking at the possible spawn points on wowhead and heres what I found.
Note: Sturdy Treasure Chest.
And when we look inside?
So keep an eye out or maybe look at the "cheat sheet" on wowhead.
http://www.wowhead.com/object=207484
PS I also want to include that on wowhead a comment suggested that the treasure chest rewards experience upon opening. Northrend chests possibly reward 50k experience per chest.. this is complete speculation. I don't have a character in that level range so I cannot confirm with certainty.