4.3 PTR: Holiday Pets Become BoU

MMO-Champion is reporting an interesting discovery on the 4.3 PTR. Many holiday pets are becoming Bind on Use instead of Bind on Pick Up! [source]

Which Companions Changed?
Not all of the seasonal companions were changed to Bind on Use. Those that were affected are holiday pets that can be purchased from holiday vendors during each in-game world event. These include but may not be limited to the following pets.
Note that the Winter Veil pets have merely had their tooltips updated, as they have always been Bind on Use.

• Spring Rabbit's Foot (Noblegarden)
• Truesilver Shafted Arrow (Love is in the Air)
• Captured Flame (Midsummer Festival)
• Sinister Squashling (Hallow's End)
• Pint-Sized Pink Pachyderm (Brewfest)
• Feline Familiar (Hallow's End)
• Green Helper Box (Winter Veil)
• Red Helper Box (Winter Veil)
• Jingling Bell (Winter Veil)
• Snowman Kit (Winter Veil)

Companions that drop from the loot bag earned after a player's first holiday boss kill of the day, such as the Frigid Frostling and Toxic Wasteling, are currently still showing up as Bind on Pick Up on Wowhead's PTR database.

We'll have to wait and see whether this change to holiday pets goes live with patch 4.3's release!