Does SQL Server 2016 support foreign keys in an in-memory table from a disk bound table
Does SQL Server 2016 support foreign keys in an in-memory table from a disk bound table

No, not at this time - A foreign key between a disk based table and memory optimized table is not allowed.
You will get below error :

Msg 10778, Level 16, State 0, Line 3
Foreign key relationships between memory optimized tables and non-memory optimized tables are not supported.