The haplogroup was actually predicted from the Y-STR results. You can get a better prediction by entering the results at www.ysearch.org. Be sure to make the nomenclature corrections I noted in the other post. You can actually just leave them out, if you want to.
Ancestry does not test for haplogroups per se. However, they MAY include it in their new autosomal test. The chip tests the markers (called SNPs and pronounced Snips), but they may not report them as such. You would need to contact them to find out.
They are still in beta and it does cost as much as 23andMe or the Genographic Project test. However, they have a backlog, so they may not get tested. The special price is for subscribers only.