I get this question a lot, and for good reason. On one hand: Every bit of information related to representation is presumptively confidential per Rule 1.6 and its state equivalents. (Different states interpret the rule differently; Wisconsin takes a particularly restrictive view.) On the other hand, if you need to move a court to withdraw, they usually want a reason (see Rule 1.16), and most of those reasons are going to contain, well, information related to representation.
