I kept waiting to hear more about this, but then stopped checking. Good to hear there's an actual date in mind.
At $50, this will kill the TS4K, IMO. Literally the only advantage of the TS4K is the USB-C port (see EDIT 2) and folks are having a lot of trouble with it.
I guess some folks might care about Dolby Vision, but since virtually no TV currently available can make use of DV over what HDR10 (which is open-source) offers, it's a gimmick. And if a person happens to have a setup that
can make actual use of the advantages DV offers, they aren't quibbling about a $50 streaming dongle.
EDIT:
Seems it's possible an FHD version with 1GB of RAM would be the $50 device, and a 4K device with 2GB would be a more expensive version. If that's the case, it's a pass for me and I'll take my chances with a TS4K at $50.
EDIT 2:
the Mi Stick 4K might come with a USB-C power port and if that's the case, I would expect it to support power pass-through and more peripherals.
I really cannot understand why they didn't make this a key component in the first place. Timing and resources, maybe?