Menu button in navbar
#Google

Heart Rate Monitor
#Samsung

Secondary BW e-ink display
#yotaphone

Secondary color display that blends with back
#Nubia

Moto mods
#motorola

OnePlus 8 Pro infrared camera
#OnePlus

Pressure Sensitive Home Button
#Samsung

Android NFC beam
#Google

Show carrier name in Status bar
#xiaomi

Dot cover
#htc

LG G5 modules
#LG

and manual rotate camera (honor 7i)
#huawei

Hardware keyboard buttons
#Sony

galaxy s4 zoom's physical camera + shutter button
#Samsung

secondary display panel
#LG

Xperia Play buttons
#sony

Physical keyboard with touch detection
#blackberry

"When installed applications, for example, were not used by the user for a long period; the smartphone automatically detected them and archived them into the cloud to reduce internal storage usage"
#nextbit

Project Linda
#Razer

Padfone
#asus

3D camera
#LG