It's not a rumor, it is absolutely happening the only question is when. Disney made a public announcement about how it was time to change it & why it was time to change & showed imagineers renditions of what will be replacing it.
That April date makes sense to me. If it's expected to take WDW approx 3 weeks, DL could take it down end of April & have it open in time to have a grand re-opening for Summer kick off (Memorial Day).