It depends on your version, and it looks like it has changed in 1.5.1.
1.5.1 or later
The command will add any uncommitted changes by default.
qnew creates a new patch on top of the current patched patch (if any). The patch will be initialized with any outstanding changes to the operation of the directory.
earlier 1.5.1
qnew -f. docs:
-f: , . , .