Some iPhone 6 users are complaining that the phone bends under pressure or when they leave it in their pocket for a long time. I’ve seen a couple of photos online and someone actually did the bend test. I remember the issue was raised as well with the iPhone 5s but I don’t remember what happened back then.
In all cases, Apple has not commented yet on the #BendGate but that’s a serious design flaw if it turns out to be true and applicable on all new phones.
Update: Here’s an article by cultofmac on the matter.