"In addition to their new features, iPhone 6s and 6s Plus also stand apart as the only models offering 128GB capacities (iPhone 6 is available only in 16 and 64GB versions,". You specs are a little off. I had both the iPhone 6 and 6 Plus and both of them had 128 GB.
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[IMG]http://forums.appleinsider.com/content/type/61/id/63619/width/200/height/400[/IMG]
This is covered in Apple's sales literature.
Plus, yes, now also for video; regular, no.
Don't (force) press - just touch for long enough to bring up the context menu. If you press hard enough to invoke 3D Touch, nothing will happen.
iPhone 7 rumors:
http://www.christianpost.com/news/iphone-7-rumors-apple-patent-points-to-curved-screen-and-flexible-display-146735/