Siemens received UL listings for new these notification appliances in early July (see this post). Although the listings in that post do not include audible-only devices, horn-only devices can be found here.
Unfortunately, this also appears to be the end of 4-wire notification appliances for Siemens, as both the horn strobes and low frequency sounder strobes only have one set of terminals.
Also, note that the datasheets do not mention synchronization with the DSC module. This may mean there is a new sync protocol to avoid patent infringement.