Unless minecraft updates to v2 without warning in the next couple of months, Sponge will probably be out by then. And that’s not even something that’s confirmed to be released any time soon. And it was already explained here why progress has slowed for the time being.
tl;dr: Forge needs to be updated to 1.8 and the ECS needs to be finished. The ECS especially is important to be carefully planned out because
Yes rainbow is out now and working great and yes that is impressive. I just wanted to make sure you knew that there is a reasonable reason behind the wait.