Dollar Tree Expecting Q2 Sales $2.17B-$2.23B vs $2.23B Est., EPS $0.63-$0.68 vs $0.70 Est.; FY15 Sales $9.24B-$9.42B vs $9.4B Est., Narrows EPS from $3.30-$3.50 Previously to $3.32-$3.47 vs $3.49 Est.