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.
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.