If it works the same way as regular potential,
rare primary/epic secondary: 10k weapon
epic primary/unique secondary: 15k weapon, 2k armor
unique primary/legendary secondary: 25k weapon, 5k armor
legendary primary: 50k/10k
All on 71+ items - under that, it drops off.
I don't know if the 1st/2nd lines are primary/secondary like with normal cubes (chance to be primary). Most screenshots do show 1st line primary, 2nd line secondary. And there doesn't seem to be any evidence of legendary ranked items yet.
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