I my view, the mechanics of a robot (strength, agility, sound, … improvements) and electronics. The latter being system on chip, hardware and software. With Nervana, Movidius acquisitions and Google, Facebook, Amazon, Apple focussing on AI, the development will be much faster than we have ever seen. Remember tgat these giants have hundreds of billions to spend on this. Hence the small victories (obstacle avoidance, playing Go, recognising objects and people in pictures, speech recognition, …) will turn into robots driven by chips intelligent enough to replace simple human tasks in random environments. Warehouses can be automated already with robots but this is a very well known environment, while, using robots to clean houses, needs smart robots to adapt to every house, every room, … . But it will take a few years until we are there.
What will it take to create a complete AI robots?