Update: Grab yours quickly if you're planning on buying it and don't want Tango instead.
I got an email back from them this morning:
Thank you for contacting We-Vibe Customer Care.
We are no longer making the Salsa, though it is still available in retail stores across the globe.
The Salsa and the Tango are essentially the same product, minus the minor difference in shape, so we decided to consolidate and stick with the Tango.
Have a lovely holiday season!