If you just migrated to Windows 7, I see no reason to turn around and replace it with Windows 8. Windows 7 will continue to be supported until 2020.
I would recommend waiting until Win 8 has matured and a few of your staff get familiar with it by using it at home.
I would also recommend thoroughly testing Windows 8 on all of your corporate applications before switching.
I am not sure what type of business you are in but if you are buying computers for a single enterprise, I would suggest that you leverage Microsoft volume licensing and install Win 7 over your new Win 8 machines or consider stocking up on Win 7 desktops. Also, it is much more efficient to set up corporate computers by using some type of desktop imaging process. Some vendors even offer enterprise-specific imaging as a service.
If you are a consultant or you are buying computers for different companies, you have fewer options to stick with Windows 7 but the option to remain on Windows 7 is still out there. It really depends on where you are buying your computers and at what volume.
I certainly would not panic at his point.