According to a new unconfirmed rumor, HTC is going to release a handset called "HTC One M8i" at some point this year. It's currently codenamed M8_QL. The name in use here implies that it will resemble the One M8, which is pictured to the left, perhaps in terms of design. On the inside, however, the M8i will be a midranger through and through.
It will be powered by a Qualcomm Snapdragon 615 chipset, namely the MSM8939. This has an octa-core Cortex-A53 processor. Four of its cores can be clocked at up to 1.7 GHz, while the rest only go up to 1 GHz.
Unfortunately we don't yet have any other specs to speak of, but the chipset choice indicates we might also see changes in other hardware areas compared to the One M8.