The effect will be so minimal you can just ignore it. If needed it would probably be something handled akin to leap seconds vs something everyone is made to deal with constantly.

I was afraid of that. Wanted to do a whole play through with the new weapons. Oh well

I’m going to be able to start this on Monday, and I really don’t want spoilers except one thing. If I start a new game will I have access to the new weapons prior to entering the DLC area?

Plato wrote many plays. Atlantis actually comes from a Plato play.