Last month SM7a was revealed, and we now know the name of the set – Thunderclap Spark! The set will feature Zeraora, probably as a GX card, and will be released on July 6th. The set will likely be integrated into our SM8 set. The dummy booster pack from last month also confirmed Virizion, Genesect and Magcargo’s appearance in the set. The set will feature 60+ cards, not including secret rares.
Zeraora is known as the ‘Thunderclap Pokemon’ so it is likely the reason behind the ‘late’ reveal of the set name, as Zeraora had yet to be officially revealed back then.