FleshEatingZipper says: "At the beginning of June, Gmail started rolling out its new tabbed inbox. I thought it was cool at first, but now it’s just a pain in the ass. Let me start off by saying that I don’t label a lot of my email and that could be one of the reasons but also, there’s really no need to label mail. Let me break it down."
But you can still go back to the old layout if you prefer.
Overall, this looks like a decent UI update for people that use multiple Google services.
Spam runs rampant on Gmail, but you have options.