I am building now. I don't think there would be any reason to wait. What is done is done as far what will happen this update. As someone on another forum mentioned, these updates are not run in real time.
I think there will be different opinions about reusing the same IP. If you are on shared hosting, without a unique IP then I personally would not worry about it - I would use it.
If this is a unique IP/VPS/dedicated etc and you are going to invest a lot of time/money into a site then I would be more cautious.
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If this is a unique IP/VPS/dedicated etc and you are going to invest a lot of time/money into a site then I would be more cautious.