The personal server still exists, and is included with the (free) developer edition.
For deployment, as an end user, the only editions available for purchase are the workgroup, standard and advanced editions, but they all include both the personal and network server.
If you are an OEM, you deploy the network server or the personal server, depending on your specific OEM agreement.
Please feel free to include me in conversations with your SAP representative if you need further clarification.
I hope this helps,
--Jason Hinsperger
Product Manager
SQL Anywhere