I do have installed the v27.0.1 (27039 build), but I did have time to design new parts (or update some others) with the initial v27.0.0 (27038) version.
Be warned to spend some time redesigning thoses parts saved/updated with the v27.0.0.
Although the SP1 update summary seems to relate to assembly constraints, when I open a standalone part, it shows up initially good but as soon as I switch configuration or simply regenerate the whole part, most of the features seem to lose references to surfaces or lines.
I did reinstall v26 alongside but as I feared it, a nice popup told me that the file can't be opened with version prior to 27038 (which seems unavailable to download).