Store seems to be set to "invitation only" now.
However, users who already bought the product got an update to 1.01 and I tried it today.
Saving patches now is broken (Workaround: I saved my changes in the plugin settings in MainStage or Logic), but Tone Cloud access shows up and you can use rigs from the large database of iOS users!
EDIT: 24h later saving works again without another update, probably a temporary bug.
Wondering about the 1.01 version number, this should rater be 0.9b
I was not able to save to the ToneCloud so far.