I would bet against the astrolabe being used again. It would be a cop out. Besides Leena is very dead.
I liked that Pete could see her aura-spirit-thingy it's a nice call back to him being in tune with his aura, and giving Leena could see auras it's a cool connection between the two of them.
Shame that's it for Brother Adrian for now, Brent Spiner was excellent.