You can find a list of the specific jobs here. It looks like each location is hiring for 8 different types of positions, ranging from Retail Assistant Store Manager to Retail Trainer. It's not yet clear what the associated salaries are for these positions or when other retail locations will start recruiting, but the company did say more news should be available soon at the Microsoft Jobs Blog.
Earlier this year, Microsoft officials said the stores would be more about building Microsoft’s consumer brand and demoing newer technologies than making them a cornerstone of its sales and distribution strategy, as with Apple. Leaked documents suggest the stores will focus on Windows 7, Xbox, Windows Media Center (Including Surface) and Windows Mobile.