I know of a couple of planned litters in the Midwest, but nothing has been announced to the general borzoi community yet. If the bitches take, I could point you to those litters when their breeders are ready to tell people.
On another note, many borzoi breeders are bad at marketing, especially to the general public. Some breeders don't have websites, and frequently, those that do have them don't maintain them well. Furthermore, just because you don't see health testing listed on a website doesn't mean the dog is lacking in health testing. If you don't see health testing mentioned, look the dog up on the OFA site, and if some of it is missing in the OFA database, contact the breeder because plenty of borzoi breeders do the testing but don't mail in the paperwork. (No, I haven't a clue why.)