The IRS has release a revised Power of Attorney (Form 2848). On the surface, it doesn't look like a major revision but there is a big change to the form. The new form is for one person only.
The new 2848 does not have a place for the spouse for a married couple. Only one taxpayer is listed in the header and can sign. In the instructions on line 7, the form says:
If a tax matter concerns a year in which a joint return was filed, the husband and wife must each file a separate power of attorney even if the same representative(s) is (are) being appointed.
Actually this change makes sense. There have been several times I've sent/faxed a joint POA and later found out that I couldn't get the spouse's info because it was never entered into the system. Hopefully, this change will solve that problem.