Voter turnout was 57.5% in 2012. So Ipsos thinks turnout will be higher in 2016 but not as high as the 62.8% as 2008.
Given the lack of a ground game in every single state by the Trump campaign, it would seem to be a huge stretch that turnout will be 60%. But, I guess we'll see. Look for pollsters to adjust their methodologies as the election nears and polls will be a lot more reliable. However, we're not there yet. Ipsos is an outlier with these state polls.