Click here for a full explanation of how team power has been modified. Please note, it is just how your team power is represented in numbers, your actual power has not been decreased.
And yes, there will be a drop in the effectiveness of your troops before you start levelling them, but once you do things will be better than they were before the update. I’m looking forward to the new status modifiers on the troops! I’m locked into a build until tomorrow, so I can’t give many details on that yet.