The following features are included in the April '17 ABM enhancement release. Check your Marketo edition for feature availability.
Synching of CRM-Mapped Standard Fields
Marketo ABM is changing behavior related to CRMs. Going forward, Marketo ABM establishes and maintains a 1-to-1 relationship between ABM accounts and accounts in the CRM. This allows Marketo to keep mapped account fields in sync with the CRM.
Custom Fields for CRM Discovery
You now can add custom fields to accounts, map them to your CRM, and use them for CRM Account Discovery in Marketo.
Account-based Filters in the Named Account Grid
You now can easily filter your named accounts based on an Account List.