Wouldn't surprise me if Zavvi announce surprise steelbooks i.e. Avengers 1, 2 & 3 with a lenti. I know we've not long had the recent 4K releases and obviously infinity war so probably not those but something else from the MCU maybe.
Those Ragnarok and GOTG2 steels came outta nowhere so who knows.
Also, if I remember correctly, Black Panther and Infinity War came back in stock (both the 3D and 4K editions) months after their release (and both were sold out at the time of the release). Ant-Man and the Wasp also came back in stock and it's still in stock, even though that was also sold out at release.