Ever since HTC formally admitted that its Vive VR headset, done in collaboration with Valve, won’t be coming until April next year, there has been no end to the speculation as to why that will be so. No official reason has been given, leaving some to wonder about possible problems.

It seems that one of the reasons might actually be because of a redesign of the Vive controllers, which is a very welcome change considering what the developer edition looked like. At least based on this still unverified leak.
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https://www.slashgear.com/leaked-htc-vive-images-hint-at-redesigned-controllers-22419639/