I think it's far more likely to be similar to the Emblem of Heroism/Emblem of Valor situation at the start of Wrath. Emblem of Heroism was from heroics and 10 mans, and there were some very good items to be bought with them. Valor were from more difficult content and was used for more powerful items. I imagine Justice points will be from Heroics and the higher tier points will be from the random heroic and raids.
I wasn't playing at the start of Wrath nor at the end of BC. When patch 3.0 hit, did the high-end BC emblems convert into emblems usable for Wrath craftables/gear? If not (everything I've read seems to indicate it didn't), I wouldn't expect Blizzard to now start carrying over from Wrath to Cata. With Blizzard's prior statements that 10/25-man will share loot tables, that point gains each week will be capped, and that reaching the cap will be possible either through Heroic dungeons or through raiding or a mixture of both, I think all of it will be granting the new Hero (?) points.
I've been trading in for gems and PSes to auction now before the ship begins to sink. Maybe it's the wrong move, which is why I wanted to know if anyone had actually seen to the contrary.