Now, a while back a Rioter said that the Taric update would be after Jhin, but before the next champion. Jhin's been out for about 3 weeks, so we're getting closer to the time where we could see a teaser of the next champion.
We're also getting a new PBE cycle today, and new reworks and stuff almost always gets revealed the day those begin.
In other words, if we're going by this information, we could very well see Taric on PBE tonight. As far as timing goes, it would make a lot of sense
I don't wanna get anyone's hopes up, but it's just a hunch I had.
But hey, that's just a theory.