Several retailers have put up pre-order information for a 2nd Avengers wave of Marvel Legends in 2018. The wave is to include the Black Knight comic book figure announced at London Comic Con as well as Ant-Man and the Wasp movie figures we saw at Toy Fair. We also know from Toy Fair that a repainted Malekith is also included, although Hasbro never made a promo image available.
The listings are now confirming that the wave will be completed by figures of Thor and Black Widow from Infinity War. The build a figure will be the 2nd member of Thanos' Black Order announced - Cull Obsidian / Black Dwarf.
The wave is due to ship sometime in July 2018 in the UK, potentially a month or so earlier in US