HTC did a great job with the camera tech on the HTC One (M8), but what else can be done? HTC wants you to answer that question, as they have released the initial SDK preview for the Dual Lens API for all third party developers.
HTC teases new HTC One in UltraPixel technical translation video
HTC UltraPixel camera explained... Sort of. HTC has put out a new commercial explaining some of the features in the original HTC One. The same features that we assume will be in the "All New HTC One," plus a tease for a little bit more.
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The Butterfly S, however, is more like a beefed up One. While no reliable specs are available, it is said to have a larger battery, Micro SD slot, and updated Snapdragon processor. Expect the phone later this month.