Visual Studio Project implementations provide a list of files that should be added to the source control as part of their SCC support. AnkhSVN 2.0 captures this list (and logs several events to receive changes), so it does not use a specific template.
The implementation of the templates would create a specific type of project AnkhSVN, and the Visual Studio SDK allowed everyone to create their own type of project. We used to use smart patterns when the AnkhSVN add-in is 0.X / 1.X, but as an implementation of SCC VAPI we no longer have to guess.
When AnkhSVN has this list, it checks non-added files for the subversion ignore status (Global ignore pattern and svn: ignore in the directory) and suggests files that are not ignored as “new” (they should be added).