If the photo is legit, then the One Mini's hardware will indeed match all the hearsay and speculation. The device is said to be a shrunken-down version of HTC's flagship device, which, unlike the HTC One, features a 4.3-inch LCD screen and a thinner and shorter frame. The phone will likely sport the same gorgeous unibody aluminum chassis as the HTC One.
Other speculation points to a 720p, not full HD 1080p, screen and a watered-down dual-core processor. You can expect Android 4.2 Jelly Bean, the latest iteration of Sense UI, plus all those fancy camera features the HTC One brought to the table, including HTC Zoe.
When should you look for the HTC One Mini in stores? Rumor has it, not before Q3, which falls in line with the phone's possible fall availability.