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The filesets API should not be in projects main module but in a separate submodule because it is relatively independent on the rest of projects.
jpokorsky is working on this, see projects/filesets in CVS
filesets are still part of projects javadoc. Sorry.
Separating to a submodule is a task of issue #16647. It would be appropriate to keep this as a blocking subtask. The first step is already done. See the projects/filesets module. Until API of the new module won't be refined the old one has to stay.
The new FileSets API is ready in the projects/filesets module. I have deprecated the org.netbeans.spi.projects.filesets.* package. As soon as the projects module and the java module will be adapted to the new API the package will be removed. It is a goal of the issue #27376.