As of now we don’t have scans of the set versions, though it’s fair to assume that these cards will be featured in regular versions in Aether Revolt. I would also wager that both are mythics giving how unique the effects are.
Both cards are likely shoe-ins for Commander play, which will inflate the value of these Inventions, though Planar Bridge doesn’t have the makings of a tournament staple. I can imagine Paradox Engine doing busted things with artifact and creature mana, though at five mana it’s far from a guarantee. I’m not terribly excited for the set versions, though these are likely to be two sought-after Inventions.