Batman toys really going to be worth

Are the Batman toys really going to be worth a lot later? My nephew just got some Batman toys for his birthday. He got Batman, some Clown guy and the Joker from the new movie comming out this summer. Should he keep them in the boxes or can he play with them. He is 6 and asked me because his friends were telling him he should not open them. If they are, are they only valuable now or will they be valuable in the future? Thanks.
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[crait]

No?

Possibly, how much do they cost now? If he really wants to open them then get him some others to play with while keeping the others unopened.
I don't think it would be worth much later though imo.

[BKFraiders7]

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