Due to other projects there has been a delay. Now 5.5 is in Preview, and with the all new advances in Lumen, we will be releasing the next version once out of Preview.
We did a build in 5.4, but there was lots of bugs, so we didnt want to push out an unstable version, and time has to be on paid projects sometimes sadly.
We hope for your further patience on this, and will update on progress in the coming weeks.