Much of this is nothing new. It sounds as though the paper announced a more accurate model to predict the solar cycle and said nothing about a mini ice age.
The low sunspot / magnetic activity in solar cycle 25 has been predicted by other authors for at least 10 years. Solar Physicist David Hathaway predicted this back in 2006. See -
http://science.nasa.gov/science-news...may_longrange/
The predicted 60% reduction, is a reduction in things like magnetic activity sunspot numbers and results in reductions of related phenomena like prominences and coronal mass ejections. It may also result in a small reduction in solar energy output but nothing like 60%. A 60% reduction in solar output would not cause a mini ice age but would cause an apocalyptic change to the the Earth's temperature. Mars gets about 40% of the insolation the Earth receives due to its greater distance from the Sun.
Joe