As I mentioned above, the total cost (employer + employee) for next year workplace provided insurance where I work seems to be going up 5-10%. This is greater than general CPI inflation.
However, ACA markets may have limited competition (how many people here are seeing monopoly or duopoly situations in their area?). In addition, increasing prices may drive away some healthier people who feel that they cannot afford it, leaving only the sicker more expensive people buying insurance (unlike workplace insurance that covers the healthy as well as the sick).