Nothing is set in stone yet, but it seems the Corona virus is affecting the development process of Mojang. Currently the staff of the Minecraft company in Stockholm is working from home, affecting their workflows. Because of this, Mojang is re-evaluating their commitment to an April release.
This is the tweet from Mojang:
If the deadline is impacted, we’ll probably hear about it shortly. But with April getting closer by the day, it wouldn’t be surprising to see a delay.