I think mib4 will be based in the 60s, and will ahve news stars, there wont be any of the old cast
depends on will smith i suppose. if he's only willing to commit to essentially a 'guest' appearance, then you might be right - he could appear at the start, his character could then go back in time to be his younger self (maybe a backdoor 'pilot' for a reboot?) and then he could appear at the end to wrap it all up.
.......but in the first movie K doesnt remember this
I don't recall anything in MIB that contradicts the events in MIB3. The fact that K never mentioned it - doesn't mean it never happened. In fact - their retconned previous encounter could be interpreted as the reason K ended up recruiting J into MIB.
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depends on will smith i suppose. if he's only willing to commit to essentially a 'guest' appearance, then you might be right - he could appear at the start, his character could then go back in time to be his younger self (maybe a backdoor 'pilot' for a reboot?) and then he could appear at the end to wrap it all up.