Same boat here. Love the LR4.
Though I’d call the next version something like LR4S+. If it were to even vaguely resemble LR4.
Not sure LR4 had even officially been announced.
Sort of the Google approach to releasing, except without the product abandonment.
tool changer. 
lol, a 400+ feature on a 600- cnc …
a version capable of using the smol closed loop 17 would be more intresting. (a little heavier z assembly i would prefer)
Consider seeding and guiding two efforts, the first being the priority for the masses MPCNC TNG, and, a more experimental to the moon, let’s see what’s possible, effort for the tinkerers here to collaboratively explore accomplishing features/speeds beyond a vanilla LR. Expecting successful useful experiments end up becoming more broadly adopted.
I would only release a new LR is if was better. I think better equals no XZ plates with no loss of abuilities and no gain in footprint.
I am really trying to minimize my list of projects to maintain. I think everything here could be substantially improved if I had time to focus on them more. Seems the easiest way is cull the list.