The April release has been received very well, but we also received some bug reports, like freezing of Calamares, not booting ISOs and in some cases graphical issues.
To address these bugs we’ve promised to release a bug-fixed ISO. It has been three weeks now and we’re still working on it. When we fixed a bug another completely new bug showed up, so instead of a rushed release we are going to provide you with a properly fixed ISO. So, be patient we’re almost there.