Yes, the top off consists of the pump and the optical sensor piece, which will directly connect to the 1Link ports. Not much has come up as far as info about it, but if you watch BRS TV's "52 weeks of reefing" and on the latest Apex episode the show the pump and sensor(which is BAD ***).
The pump can push water up to 9' high(im sure it will have enough pressure power to get RO water way far from the tank) and the float sensor has two optical sensors and a third float as safety. If you own an apex, its a no brainer since there will be less wires, no need to connect to an outlet and i expect precise controll through the apex. To finish, Neptune has some sick quality, so im expecting a solid product.
Heres the video link, go to 22'35" they unveil the sensor;