I think it is worth noting that some online stores (in several different countries) are noting that these two toys are either already in stock, or will be within the week... without Hasbro even officially revealing them.

I wonder if they were supposed to have an embargo date, to be released globally on a particular day (like the weekend of SDCC)... and some places didn't know or didn't care.

Both of these were meant to be released here as well (Greasepit in July, Exhaust in August - at the same place as Rotorstorm), but they are back in the "unconfirmed" status at this time... so, if you find them from an affordable foreign source that you trust, maybe go for it to make sure you don't miss out if they don't end up coming here.