Good news first. Infrastructure upgrade is now completed and all the beta customers with current preview subscriptions can run their models with no additional restrictions (as per plan purchased). Thank you for your understanding and patience.
We will continue to monitor the load and performance for another 4 weeks or so, to make sure there is no impact on existing customers when we open registration to new users. That also means that preview plans are here to stay a bit longer than planned. The current ETA for the new plans is late April, early May. Till then enjoy building your cube AI model and the profits they make!