Ok, so me and a few of my fellow group members have figured this much out so far. In addition to what you see in the screenshots above...

If you havnt already figured out where to find redeem ninja fragments now, ill start by telling you to just check recruitment tab, click exchange up top, its in there.

Next, about where your power boost came from and how to get more power from the new system.

The more you level up, awaken and cultivate ninja's, the more power will stack up, even if those ninjas are not currently equipped in your team. I have tested this after one of my members mentioned it, i went on a levelling, awakening, and cultivating spree, and managed to gain at least 1.5k power just from that. I think its safe to assume that upgrading their moods will also add power. So this leads me to the conclusion that, the power boost that everyone noticed when they logged in today, is from the amount of ninjas you have levelled up, awakened, cultivated, and possibly mooded. Also, in theory, upgrading the stars of ninjas should also stack power.

Added Note: If you click on "upgrade stars" in ninja tab now, it shows stat boosts... i think this is now the way to see your stat boosts from stars collection, the stat boosts that were on the scrolls in collection before... this is where those have been transferred too i think.

Apologies if my explanation doesnt make much sense, ive never really been good at explaining things, but if it helps anyone at all, ill be happy to have been of assistance :)

If anyone else figures out more details, please dont hesitate to post here for all to learn ^_^