portmaster/pkg still populating /var/db/pkg/

Hiho! :-)

After my last port rebuild (libxml, libxcb, etc.) I realized that
portmaster is still populating /var/db/pkg with the old db scheme (i.e.
one directory for each port). At the same time, local.sqlite exists and
is up to date (I can query the db via pkg just fine).

I switched to pkgng ages ago (sometime during the winter of 2011, I
believe) - have I missed any necessary steps or is this a known quirk?

I'm using pkg-1.3.0.a10 and pkgconf-0.9.5, uname:

FreeBSD xxx 11.0-CURRENT FreeBSD 11.0-CURRENT #19
r258254:264321M: Fri Apr 11 06:31:35 CEST 2014
xxx:/usr/obj/usr/src/sys/SUBMARINE_SMP  amd64


Thanks,
Marc