How many new champions are left this year?

One for sure, maybe two but I doubt it. I think the next one will be a midlaner since we got a botlane (Rakan and Xayah), a jungler (Kayn) and a toplaner (Ornn), I play him jungler, since you really can keep farming and pressure because you don't have to back at base if you manage your camps correctly ! So the enxt one should be a midlaner !

Likely see one more this year I'd say along with the Evelynn update.

They try for 6 a year so probably 2.

Possibly 2? We know there's going to be one more in between the next two VGUs, I suppose there could be another after.

Just one Champ this year (source : Reav3)

1-2. We have 5 teams who do either champions or reworks and they usually produce one every 6 months. Ornn was done by one of the teams who did Xayah and Rakan,the other team who did this will likely release their next champ in october. The team who worked on Kayn will probably release their next project either this december or next january.

I'm pretty sure we will have a champion in October and one in December

Last year there was one in august then October and December. I expect the same schedule.

Most likely one. After them Swain will likely come out. I think.

There have been 6 a year in recent years. We've had 4 this year, but there was the Xayah and Rakan double release, so we might get 7.