Customer Portal Security - Specifically the Knowledge Base

The current security only allows the following:

All customers can access customer portal (all help files published to knowledge base)
All customers with a login can access the customer portal (all help files published to knowledge base)

We need the ability to secure according to the following:

Permit viewing access to KB articles/topics based on User Account
Permit viewing access to KB articles/topic based on User Contact
Permit viewing access to KB articles/topic based on 'Group' defined in agent support portal settings

Is this on Zoho's roadmap in the near future? If so, about when would it be available?