According to a UK carrier's inside source, HTC is working on a mini version of the recently launched second generation HTC One (M8). The HTC One (M8) mini will keep the new 90% aluminum unibody design.
The HTC One (M8) mini is rumored to come with a 4.5" display of unknown resolution, but we think HTC will probably stick to 720p for the mini fella. There is nothing mentioned on the chipset, but apparently the HTC One (M8) mini will come with a single UltraPixel camera on its back. The UltraPixel duo will be a reserved key feature to the M8 flagship only.
Finally, HTC One (M8) mini is tipped to launch this May. Given that this is coming from a carrier that should have plenty of internal information, the information is most likely true. This means we should get an official announcement should happen in the upcoming weeks.