All the boxes that have been revealed so far say "Superking" though. If it turns out to be Sparking, Sparkling, or something else, I'll fix it. But for now, I'm probably gonna go with Superking.
It's official called "Beyblade Burst Sparking", Superking is the system name
Even Though It is Pronouced as "Beyblade Burst Sparking", We Are Still Going with "Beyblade Burst Superking" Since It is The English Translated Name, The Same Thing Happened with GT, It Was Pronounced As "Beyblade Burst Gachi" But Translated as GT, and We Went with That Until The Dubbed Name Was Confirmed.
Wait but when I saw an anime poster I read ベイブレードバースト超王【スーパーキング】”beiburēdobāsuto chokingu (sūpākingu)”
I'm guessing that they mistranslated Sparking as "Superking"
Not quite. In Japanese the words are themselves pronounced nearly identically, making it a bit of wordplay in the name. It's not so easy to understand this if you don't know the language or haven't heard such from one who has.