Here are some quick answers for things already known. The full Q&A response may go into greater detail.
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Ganni1987: Will D: OS 2 have the same LAN / Direct IP multiplayer option as in D: OS 1?
Yes.
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Punkoinyc: Does this game have a more serious tone than the last one?
Yes.
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ussnorway: how many tactics allowed per class, is it rock , paper etc combat system for pvp?
Single player is the primary way people played D:OS, and that is likely to continue for D:OS 2. The options added to be able to handle multiplayer and competitive questing make the single player game much more reactive and replayable.
There aren't strict classes. The arena can be PvP; for the main campaign some quests and objectives in multiplayer will conflict and allow competitive play, but ultimately the main goals of the characters will encourage cooperation.
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Leroux: Will Original Sin 2 use the same camera restrictions or will it be possible to zoom out a little more?
The camera system is being redesigned, but that is not in the alpha version yet.
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dtgreene: If you mess up a character's build, or decide you are tired of that build and want to try something else
There will be a way to respec.
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Niggles: will there be the daylight/night climate
No. The origins and tag system are already quite complex, without adding NPC schedules, changes to opponents and quests, etc, that would be needed to have a day/night cycle that was not just cosmetic.
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Sogi-Ya: Will the GOG & STEAM versions of the game be Multiplayer Compatible
Yes, using Direct Connection or LAN.
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mordivier: What happened? I thought he was supposed to be a Messiah figure. Could we get some explanation of this? Do we learn about this in the game?
The Divine One is more a chosen of the gods than a god or demigod. There were other Divine Ones in Rivellon's history, though the one from Divine Divinity was the first in quite some time.
The explanation will be in the game.