Nothing I haven't shared around here already, but it (X+1) feels great in the hand. Not as good as the original X because of the size, but better than. say, an S5. The metal edges and the thinness of the edges help it grip better. The bigger dimple (it's not really a "dimple" anymore because it's pretty big) feels nice. I've seen multi-circle active display notifications, which I assume will come via a play store update to the X, but that's just my opinion. The X+1 will have additional sensors in the bottom bezel (not seen in the popular bamboo X+1 leak) that will offer hands-free gesture controls. I haven't seen the controls in action, just heard about what they will be used for.
If you want something new, I got hands-on with the leather version last week. Pretty nice- the texture felt like a broken-in baseball glove. Similar color, too (though there will be other colors...I think 2 more). I wouldn't get leather, but it seemed nice. There are plans to offer sports-themed leather-backed (basketball, football) devices.
Oh, and the Sept 25th release is accurate "if everything goes to plan."