we dont know
but regarding the resets of
- maze-granite (which was upsetting many players for a good reason)
- gear
- relics
- dragonrelics (+ its complete removal!)
- temporary items (at least its plannable here and no surprize)
- guild-rubies
its likely in my opinion that there will be a reset in spark-level aswell at some point
(i really hope there will NOT be a reset - however as im not sure, for example i often pass weekly quests for it and so on as i see it an "unsafe investment" - and only gain the sparkexp i gain from things i would do anyway)
also, keep in mind there is an over-time multiplier for spark-exp so the longer you wait the easier you get your exp - beeing slow saves work and time here while those who give 100% suffer from getting less exp for more work in comparison to those who do it in a sloppy way