Not word for word but it was before the Slayer tour and it was something along the lines of "regrettably inform, yadda yadda yadda, not enough time, yadda, yadda, yadda, wish them the best." They never announced a replacement and Ron's never said he was recording without Gene but Gene did say he was leaving because of time. From previous stories they had recorded anything from part to nearly all of an album but it was not finished. Makes sense to wait for Gene especially since Ron doesn't seem to be in a hurry, but Gene might have made his announcement thinking the album was closer.