Newest wave ( purple) sighted at Settlers Green TRU Express in North Conway NH.
*Squeee!! Wave 2!*
Could be wave 2 or wave 3. See below for bag images to tell the differences, or you can tell by which ponies are in the set.
And for our purposes here: (images from strawberryreef.com)
[img2]http://strawberryreef.com/images/Ponies/FIM/ApplejackFIMpvBlind1_M.jpg[/img2]
Wave 1: Pink/red edge, Rarity top-left, Twilight bottom-right, Castle in back.
[img2]http://strawberryreef.com/images/Ponies/FIM/ApplejackFIMpvBlind2_M.jpg[/img2]
Wave 2: Purple edge, Rarity top-left, Twilight bottom-right, House in back.
Set has lots of ponies that were made into G4 brushable toys: Blossomforth, Cheerilee, Daisy Dreams, Dewdrop Dazzle, Feathermay, Honeybelle, Lulu Luck, Rainbow Flash, Snowcatcher
[img2]http://strawberryreef.com/images/Ponies/FIM/blindbag3_M.jpg[/img2]
Wave 3: Purple edge, Rainbow Dash top-left, Twilight bottom-right, Luggage in back.
Set has boy ponies: Big MacIntosh, Goldengrape, Meadow Song, Noteworthy
[img2]http://strawberryreef.com/images/Ponies/FIM/blindbag4_M.jpg[/img2]
Wave 4: Blue edge, Applejack top-left, Rarity bottom-right, Crystals in back.
Set is all crystal/metal ponies.
[img2]http://1.bp.blogspot.com/-J8nn1OhS1E4/T16NV00d_LI/AAAAAAAAibw/6pdiPse7ECs/s1600/box.jpg[/img2]
Wave5: Yellow edge, not much more known about the bag (I couldn't find an image of the bag).