CES 2019: Tech preview of the expo's hottest new gadgets

The CES trade show is powering up again in Vegas. Most of the biggest names in tech and stacks of start-ups you've never heard of will compete for attention over the next week. Some products may launch new categories - past events presented a first look at video cassette recorders (VCRs), organic light-emitting diode (OLED) TVs and Android tablets. But many more will flop or never even make it to market. We've scoured the internet for hints about what will be on show... One of the biggest developments at the last few CES expos has been Amazon Alexa and Google Assistant's rival efforts to extend their reach in the home and beyond.