The update's been done for up to 0.15.8. However, a number of work needs to be done:
re-evaluation of the new laser color weapon system;; over-strike feature not included currently
balance changes in line with vanilla
new sprites for the following regardless whether they get introduced now or not. This is what takes the most time.
gravity_well_projector; The prototype has been completed last year but has no specific sprites yet. May need adjustments. Otherwise ready to go.
DS Laser II, this is a next generation which will partly be able to use old parts but mostly rely on a newer modular system. Plans are still being refined as parts are being tested. Existing sprites may have to be reworked while new ones need to be made. No date set.
various other updates
So this is the current situation. The over-strike feature is in limbo. ▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆. so I can't say whether it'll be added or dropped as this point.
I don't think there will be a release anytime soon.