I know some of creative writers in Riot are gone, but does this mean no more JoJ, League of Judgement, and good lores? If not, when can we expect to have those back?

They said they've been a bit busy lately. Hopefully they bring the JoJ back soon

A Riot post said there will be one later next week.

The said post was made last Sunday, so hopefully (if they count Sundays as the last day of a week) it means later this week.

We are still yet to hear about the ETA on Shyvana's Judgement, though.

Im expecting the next JoJ for today or tomorrow at most but i have no idea :S

We will most likely get a JoJ which features Shyvana and Fizz (similar to how the last JoJ hints at Xerath and Graves)