Hi,
Which editions do you refer too? If we're talking about CRM On-premises deployments, then there are only two versions: Workgroup and non-Workgroup and all of them support multiple form layouts.
The same with CRM Online.
msdn.microsoft.com/.../hh699677.aspx
With CRM Online, the limits are only with the number of custom entities (300) and workflows (300). No limit for form layouts.
Please be aware that to deliver dynamics form layouts depending on users' departments/roles, you need to use security roles and assign the form layouts to correct security roles.
If you want to delivery dynamic form layouts depending on data of the record/record status (e.g. show/hide certain sections/fields depending on account types, or opportunity statuses), then you currently still need to use JavaScript to show and hide them.
With the new Orion release coming later on this year, you will be able to achieve this using business rules/logics without scripting.
