Within a few hours of releasing StyleCop for ReSharper 1.0, we've managed to create a ReSharper 4.5 Beta compatible version. The changes JetBrains have made to ReSharper 4.5 are vast, which is not surprising when you see the stats for the performance increases they've managed to achieve. Luckily JetBrains have created a document on their wiki to aid with the migration of plugins from 4.1 to 4.5; this doc shows the scale of the changes they've made.
StyleCop for ReSharper 1.5 is available from the project CodePlex site. Please report any issues you find.
Once again, thanks to Andy for all the hard work.