David Duarte (Revit Beginners blog) mentioned in a post at AUGI that he's observed that detail lines in drafting views that are drawn at very small angles no longer generate warnings or are stored in the Revit Warnings dialog box. He posted at AUGI looking for confirmation that it is supposed to be working this way now or not. I don't recall it being mentioned at all in the various sessions regarding new features.
In my testing I find that Model Lines do generate a warning message and store a warning but Detail Lines do not when sketched in Drafting Views (or plan views for that matter). In the following image (in a regular floor plan view) the model line generates a warning but the same angle does not for the detail lines.
Hopefully this is an intentional change. Regardless it is welcome since I've seen many projects littered with such errors in drafting/detail views. In particular those that have been created from external cad data originally. Now they just need to reconsider the <1/32" (less than) line length limitation, at the very least in drafting views.