According to Beckett, Topps Heritage will be releasing a minor league set this September. Of course, there will be Bryce Harper cards in there including autos and auto relics. I'm not a huge fan of minor league cards, but I do love the Heritage line. Might pick up some of these, but probably won't go overboard like I did on the regular 2011 Topps Heritage set.
A very preliminary and only partial 2011 Topps Heritage minor league checklist