In conjunction with episode 50, uzumaki report #39 recaps the past arcs and memorable character interactions of the anime as they prepare for the chuunin exams.
It also mentions denki and sumire ‘Enters the scene’ and ‘takes action’. This isn’t meant as confirmation of their participation in the exams, but likely a foreshadowing of how they’ll progress and develop as characters.
‘Urashiki Otsutsuki Enters!!’
An Ohtsutsuki like Kaguya, revered as the strongest of his clan, will stand in the way of our heroes.
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Also Episode 53 is called ‘Himawaris birthday’, which would air only 2 weeks after the ‘boruto’ birthday episode’. So either we’re getting a small time skip or the siblings share close birthdays.
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