Today Dan presented the Opportunity Kanban view as a key feature in Lightning Experience that helps sales users easily manage their Opportunities. In order to take advantage of this feature, please note the following:

1. You can’t view the Kanban for Recently Viewed list views.
2. Filter your records to select a single record type or view a particular subset of your records. Records are separated based on record type.
3. Quickly move a record to a different column by dragging the card.
4. Yellow alert symbols help users know that they need to keep a deal on track, for example, create a task or event. 

Other considerations for Kanban: https://help.salesforce.com/articleView?id=kanban_considerations.htm&type=5