Not a dev, but just adding answers based on my own experience...
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1) Will there be different ammunition types for LB-X autocannons? Solid shots and cluster rounds?
TT rules, yes. Previous games, yes. This game, likely no (at first). Possible addition later.
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2) Can we switch ammo bins in battle? For example if I notice my right torso armor is running low, can I switch to ammo bins in this torso to "get rid" of this ammo first.
TT rules, yes (I think). Previous games, no. All like ammo was added together and if you had any number of rounds left then all 'bins' still were occupied. This game, likely not.
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2.1) If the answer is no, can we assign ammo priorities before battle? Which slot to use first, then second etc.
TT rules, yes. Previous games, no. This game, likely no.
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3) Can we dump individual ammo bins in battle?
TT rules, yes. Previous games, you could dump ammo from each weapon type individually, but it would dump all ammo for that weapon type no matter what location it occupied in the 'Mech. So, kind of. This game, maybe. If it happens, it will likely be similar to previous games.
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3.1) If the answer is no can we dump all ammo in battle?
See previous answer.