This passage relates a concern that has been previously raised. We will need some type of conversion utility to use the Ancestry data on gedmatch or other sites:
"AncestryDNA has said they will release the segment information sometime this year. When they do, the information will still not be directly convertible to compare to other companies. You will need to convert the Mbp to cM to be meaningful. But you should be able to do a direct comparison to your AF location."