Oh, that is good news! I really haven't been paying attention, but I was sorting my manga the other day and thinking, why hasn't there been a final series! But hopefully there will be now. I hope they go back and start it where it should have started...but I'm not sure they will. They skipped a whole game between Ichidai and Yakushi and while the game in the manga bores me to tears, it's still part of the plot...
Yeah, that final game did take...was it eight months of manga? Or was it more??
I did go look up the announcement post but nothing in the Japanese indicates timescale. So we don't know yet. I guess your timeline is probably accurate...maybe October if we're lucky, but I think the last two were January starts.
I am trying to imagine how many series it would take to finish Yona. Not that Yona is finished, yet, but it's definitely moving in that direction. I know I've been saying that for ages but still.