It appears Propellerhead indeed had a version of Reason for iOS up their sleeve. According to Synthtopia they will release, Figure, an iOS app based on Reason technology, shortly. It will debut for just one dollar. Propellerhead will also be opening up Reason for third party developer plugins. Apparently Korg is among the first batch of developers bringing out Rack Extensions for Reason.
Great news from Frankfurt already, then. Tomorrow the big fair opens up officially, let's hope there's more interesting news coming.
Read more about Propellerheads news at Synthtopia.