Can I use "when" + future tense in this case?
I'm not sure when it will be released.
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After when, you use present tenses like simple present, present continuous, present perfect, etc. to refer to the future - where when introduces a subordinate clause But, It does not apply to indirect question or constructions as in
I am not sure when I will clean the house. I'm not sure when it will be released.
Yes, you can and another correct alternative would be:
I'm not sure when it's going to be released.
Per existing answers, "future" tense is more common in such constructions. But per Barrie's comment to Rimmer's answer, English doesn't really have a future tense anyway.
I see nothing wrong with, say, I'm not sure when it's available. I accept there is often at least some implication that the date of availability/release/whatever may actually have already been set (even if that date isn't known to the speaker), but I don't think this is a precondition for the phrasing.