Normally, HTC reserves the right to void your warranty if you unlock the bootloader. But seeing as the DE comes with the bootloader unlocked, its never been clear to me how the warranty works in that case, I'd be curious to hear how they respond.
And yes, as the previous response states, the "cloudy" photos is an issue with the camera glass or coating being easily scratched, which is easily fixed by polishing with toothpaste, Turtle Wax, etc.
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Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)