Extensive testing will begin with all of our products on IE8 moving forward. How long updates will take will depend on the results of those tests with the released version. Updates could be not necessary at all, or could take up to a couple of months depending on the severity of the issue and the number of products effected.
Currently there are no known issues in IE8, so if you test and find one please let us know. We will begin treating reported issues on IE8 as bugs.