Will I get access to all new features in beta regardless of my plan?
No. Not all Betas are available for testing for all users. Availability is based on account-specific configurations – meaning you may not have the modules enabled that are needed to participate. For example, if you are in a Standard plan, you will not get features such as Workspaces during the beta.
Unless you're planning to upgrade. If that's your case, contact your Customer Success Agent.