No - as long as the other items have no dependency on or interaction with the OSM layer, the generated PDF is clear of license conflict: it is still merely a composite display of independent sources, not a work produced on the basis of OSM data. If the OSM data was rendered without modification then it is not necessary to release the other data sources. Cf. http://wiki.openstreetmap.org/wiki/Open_Data_License/Use_Cas...
They've changed their tune then, because that used to be explicitly called out as an example of a grey area in the old license that they would be prevented with the new license.
If that's correct then that's fantastic.
Given that it's contradictory to what used to be claimed, it still makes me concerned about touching it without having a lawyer going over the license in great detail, though...
