What do you mean by that? According to the pricing FAQ [1] not only there's no auto-scaling, but adding concurrent processes costs $40 a month each:
The unit of scale for a runtime service is a service process, which represents a single concurrent connection to the service. By default, a new service has one service process associated with it; additional service processes can be added to any stack. Specific pricing of additional service processes depends on the edition of DotCloud you are using - in the Free plan, additional service processes are not available, while for Pro, additional service processes are priced at $40 / month.
Whoops, I definitely miss-read the portion on services vs service processes. The beta had no concept of service processes, it would just scale out from the single service for you. I'll edit my parent comment to reflect that.
... Which now that I think about it, makes extra sites even more expensive. Beyond the 4 I'm already using for a single site, if I wanted to add a single new service for a site to hack on, I'd have to upgrade all the way to Enterprise (with all the cost it would entail). Ugh.
No, you won't have to upgrade to enterprise. You can purchase extra capacity, and allocate it to deploy as many services as you need. Those 4 services are simply what we bundle into the $99 price point.
What do you mean by that? According to the pricing FAQ [1] not only there's no auto-scaling, but adding concurrent processes costs $40 a month each:
The unit of scale for a runtime service is a service process, which represents a single concurrent connection to the service. By default, a new service has one service process associated with it; additional service processes can be added to any stack. Specific pricing of additional service processes depends on the edition of DotCloud you are using - in the Free plan, additional service processes are not available, while for Pro, additional service processes are priced at $40 / month.
[1] http://www.dotcloud.com/pricing/pricing-faq/