Next generation probiotics in disease amelioration, 2019 indicates that we may see the following in the next years.
- Prevotella copri
- Christensenella minuta
- Parabacteroides goldsteinii,
- Akkermansia muciniphila
- could be available on the market by the end of 2021 through the Belgian spinoff company “A-Mansia Biotech<https://www.a-mansia.com/>”.
- Bacteroides thetaiotaomicron
- Faecalibacterium prausnitzii
- Bacteroides fragilis
- Eubacterium hallii 
- Ruminococcus bromii 
Where and when they will be available may get complex. None of these would be grandfathered with the FDA, thus they will be required to produce the same type of evidence that is required for a new living vaccine before they may be sold in the US. Mutaflor, E.Coli Nissle 1917 has been used in Europe for over 100 years and sold over the counter, but cannot be sold in the US because of FDA regulations requiring a massive amount of US based testing to prove that it is safe.
Some may only be available by prescription in some countries.
Mutaflor is sold OTC in Canada and Australia which did not require those loops to be jumped thru.
NOTE: Probiotics for pets (Veterinary) do not require such review — Fido may get them before you do!