
It looks like Shimano are next into the fray with their 2016 power meter.
Although the main unit is spider-based, as shown on the above image from cyclingweek (thanks also zitasport.com), it seems that the actual system will be dual-sided. Left-side power will be achieved by the addition of a crank based devices similar to the STAGES power meter.
Last Updated on 5 February 2019 by the5krunner

tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors.