Hasbro had previously confirmed that there would be at least one Thor themed Legends 6" wave to coincide with the release of Thor Ragnarok.
The first three figures from this wave have been announced. First up is a comicbook Ares, a welcome re-release considering the price the original 2008 Walmart Exclusive version is bringing on the secondary market. We then have Thor and Jane Foster Thor. These two look to be tweaks of the figures included in the SDCC 2017 exclusive boxset.
Thor is presented in the standard release without the beard he sports in the SDCC set. He is also now wearing a shirt.
Lady Thor appears to be the same with the exception of Mjolnir which is glowing in the SDCC set, but normal in the standard release. There may end up being some decor variations too.
The rest of the wave will be made up of Movie based figures from Ragnarok. Hasbro are not revealing these at this time, we might get a look at SDCC next month.
Purely speculation, but you would assume a Ragnarok Thor is inevitable. I think Loki, Hela and perhaps Valkyrie are also in with a shot of inclusion. You would have to assume the Gladiator Hulk would be the Build-a-Figure?