AMD's high-end desktop lineup will not stay limited to XFR-compatible chips. Apart from the initial barrage of Ryzen Threadripper CPUs, there is also a mid-range Ryzen Threadripped 1920, which is still unannounced. CPU support page from several motherboard vendors has revealed a non-X Threadripper 1920 that AMD is yet to release.
According to the Tweakers, the Ryzen Threadripper 1920 CPU has listed on websites of different vendors namely, Asus, Gigabyte, and ASRock. It was confirmed that the listing on Gigabyte and ASRock's sites are true, however, Asus has since scrubbed its support page for the $550 ROG Zenith Extreme entirely.
The AMD Threadripper 1920, like the 1920X, has 12 cores and thus 24 threads. According to Asus, the 3.5GHz base clock is similar as that of the 1920X, but as per the ASRock, the clock speed is 3.2GHz. The latter seems more reasonable since it is lower than TDP. The boost speed is not mentioned in the listing, but it is most probably lower than the 4GHz of the 1920X, as reported by PC World.
The motherboard support pages don't mention pricing for AMD Ryzen Threadripper 1920, though it'll certainly slot somewhere between the $550 Threadripper 1900X and the $799 Ryzen Threadripper 1920X. Ryzen Threadripper 1920 is expected to announce sooner than later. However, as the ($1,000) Threadripper 1950X and 1920X are scheduled for release on August 10.
So far, AMD has officially unveiled three Threadripper processors. The AMD Threadripper 1950X and Threadripper 1920X come from August 10th and at the coming end of the month, the cheaper 1900X is expected to come. Whether and when AMD will announce the 1920-variant mentioned by Asus is still not clear. However, we will have to wait till month end, when AMD launched the all Threadripper processors.