The Titans Return Arcee (with Ultra Magnus head) was always noted as being just an advance release at HasCon, but it didn't guarantee that it would be released like the HasCon edition, or with the Ultra Magnus head.
It has now been listed on the American ToysRus website for an October 5th release for US$25, and the images included & written details show that it should be the exact same pack as the HasCon release.

The TRU website notes a 2 per customer limit like the HasbroToyShop website, but this could put more in circulation for fans outside of America to be able to get one without paying US$100+ for it.

I will have to see if we are getting this here, and if we aren't, I will petition for it to come here. I think the previous Japanese Legends release of Arcee did well enough here, so this one should as well.