Polygon claims to have the internal memo in question, presented in a series of quotes. It claims that the issues experienced in North America are starting to spread overseas. "It's also now evident that players across Europe and Asia are experiencing the same frustration." It also claims 700,000 cities were built in the first 24 hours after launch.
Yesterday, EA Maxis disabled certain non-critical features in SimCity in an attempt to help lighten the load on the servers, which are also growing in number. SimCity is dependent upon a constant online connection. Being an unavoidable part of the experience, server woes have caused us to hold back our review.
Update: An EA representative has confirmed with Joystiq the internal memo in fact leaked today; however, this representative did not go into any further detail than that.