The tides have shifted.

How purposefully vague so that if ANYTHING happens, you can say "See, told you." If nothing happens, you can say "Keep waiting."

If you have nothing more than a vague "The tides have shifted," Why bother?

Do you mean literal tides, like oceans, or more figuratively? Oh wait, you can't say more.

Need more info, please

Absolutely.

In the last few days, we have had some kind of serious alteration/shift.

EVERYTHING is in flux.

You may very well encounter people and subjects you have not encountered for 4 to 5 years right now. This may not be pleasant either.