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The Nougat-powered HTC Bolt (known internally as Acadia) will be a mid-range phone with a 5.5-inch 1080p display, 3GB of RAM, and 64GB of storage. It charges over USB Type-C, but that's also probably where you'll get audio. There's no headphone jack, despite the device being more than large enough to accommodate one. It does support BoomSound, but only via headphones (presumably via an adapter).
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The Bolt keeps the same basic aesthetic as the HTC 10 with the metal frame and chamfered back. Although, the chamfer doesn't look quite as extreme on this phone. The camera back there is 18MP with an f/2.0 lens and 4K video capture. The front camera is 8MP. It's unclear when the device will be announced, but it should be available worldwide, including in the US on Sprint.