While the company announced its entry into the Windows 10 Mobile market back in February, HP released the Elite x3 in August, and has since been hard at work supporting the device with new firmware. But it looks like it isn't done yet, as it reportedly has new Windows 10 Mobile hardware in store.
According to a report from Dr. Windows (via Phone Arena), HP's next handset will be a mid-ranger, powered by a chipset in Qualcomm's Snapdragon 600-series. The specific SoC may be the Snapdragon 617, as that's the only one from the series to be officially supported by the OS, unless the phone doesn't ship until the hardware requirements change (as they likely will) after the Creators Update.
A Snapdragon 617-powered handset from HP would be a less expensive alternative to the Elite x3 - which uses a powerful Snapdragon 820 - while still supporting Continuum, a feature that the company heavily invested itself in with accessories such as the Desk Dock and Lap Dock. Unfortunately, the full-stack solution for the Elite x3 can be quite expensive (although you can currently grab all three items for $999), especially given the price of its Workspace virtualization service for x86 apps.
Of course, this is just a rumor and should be treated as such. If it happens at all, the new device will launch next year, but other details are unknown.