Further to our report earlier in July that Amazon is hiring staff for a new, unspecified physical store in Detroit (either a Books store or a 4-Star outlet), the company is now similarly hiring for another new store in Houston. Separately, in line with earlier indications, Barnes & Noble has opened a new roughly 14,000-square-foot store at Cityplace in Woodbury, MN, taking the place of a larger, nearby store that closed on Tuesday.