It's very unlikely to be ready by then. I’m not sure what there is to announce? It wasn’t promised for then and we haven’t had any updates on it that I can think of that we need to follow up or correct? People were posting assumptions and I corrected them.
Well, the general sentiment espoused by people of significance, in the post-gencon-2018 discussions (if you really want, I can go forum diving for instances) was "no promises, hope we can release ilclan next gencon" followed by more or less silence on the matter until now. At least, I haven't seen any indications prior to the current discussion that this was no longer the case. It may or may not even have been referred to as ilClan, I don't remember. But there were definitely people eager to see when the next installment following Shattered Fortress came out, and "maybe next gencon, we hope" was the general answer I recall seeing.
That said, if the next plot-forward book is unlikely to come out for gencon, would it be possible to get some indication when it might be more likely, to better calibrate our hopes and expectations?
Edit: I went diving, and it was GenCon18's CGL Panel where it was mentioned that the hope for ilClan was GenCon19.