I think Weta do have a good reputation on finishing a line... Weta did sort of hinted that they have many characters in this upcoming line. I believe it is just timing and all, since they have other projects to work on it. Plus, with New Zealand's recent lockdown, I'm not surprised things are getting delayed... :/
For Supes, it took them 3 months to go low stock, after showing the prototype video and pictures back in end July. Which is pretty good sales imo. We have 3 months to go for him to ship!
I'm with you guys on hoping for Queen Studios to release a Blue suit Superman 1/4, which I can feel it's definitely in their pipeline for 2022. QS did mentioned that they want to finish off releasing the Iron Man line first before tackling their future pieces.