Amount of teams at the 2026 World Cup and beyond:
- UEFA (Europe): 16
- CAF (Africa): 9
- AFC (Asia): 8
- CONCACAF (North America, Central America & Caribbean): 6
- CONMEBOL (South America): 6
- OFC (Oceania): 1
The host country will not get its own spot independent from the host's confederation, but instead it will take a spot from its confederation (for example if an European country hosts the World Cup UEFA will only get 15 spots during the qualification stages).
The final 2 spots will be decided via a play-off system. 6 teams (1 from each confederation, except UEFA, plus an additional team from the host's confederation) will compete in these play-offs. The 2 countries which are the highest on the FIFA World Ranking will get a bye in the first round, while the other 4 teams will play for 2 spots in the final. The tournaments is scheduled to take place the November before the World Cup takes place.
http://www.fifa.com/about-fifa/news/y=2017/m=3/news=bureau-of-the-council-recommends-slot-allocation-for-the-2026-fifa-wor-2878254.html