The yellow version of Hot Dog appears to have begun hitting the shelves of Walmart according to reports from
forum members of sightings of the exclusive Molten Hot Dog in a few stores.
Molten Hot Dog is much like the regular Hot Dog that you can already find in the Scorpion Striker Battle Pack, except his colours are switched around being red where he was yellow and yellow where he was red. He is an in-game variant much like Granite Crusher, Punch Pop Fizz and Gnarly Tree Rex so he will appear that way in-game. In the United States he will be exclusive to Walmart, exclusivity arrangements in other countries are unknown at this time.
And recently the Legendary LightCore Chill toy has begun showing up in Canadian Toys R Us stores, if it follows the pattern of the previous post-launch Legendaries it shouldn't be too much longer before she is available in further countries. Being a Legendary she is of course an exclusive to Toys R Us.