I've now seen some videos about the new 2x4 #LEGO Smart Brick and IMHO it looks interesting, technology-wise. It seems to feature lights and a speaker as well as a gyro/accelerometer, a colour sensor, RFID(?) reader(s) and someone also said microphone and/or pressure sensor. It has a battery and offers wireless charging. All known technologies but the RFID(?) direction finding/positioning feature really looks like a nice innovation. At its core seems to be an application-specific IC (ASIC). 1/n