I'm not sure I should count this as a "cured in mice". Basically the researchers took mice that had a compromised immune system, and then made them diabetic by poisoning their pancreas, and then cured them by implanting human embryonic stem cells (hESCs). I think this proves that they know the recipe to turn hESCs into functional beta cells (a huge advance in itself), but it is not a cure for real type-1 diabetes, because the autoimmune attack would still kill off the new beta cells. The mice used in this experiment did not have autoimmune (type-1) diabetes.
From the abstract:
As graft-derived insulin levels increased over time, diabetic mice were weaned from exogenous insulin and human C-peptide secretion was eventually regulated by meal and glucose challenges.
Press release: http://www.eurekalert.org/pub_releases/2012-06/uobc-scc062512.php
News article: http://www.dailyrx.com/news-article/type-1-diabetic-mice-no-longer-need-insulin-treatment-after-stem-cell-transplantation-1