Kalen Delaney has a final version of her In-Memory OLTP whitepaper:
Click on “SQL Server 2016 In-memory OLTP technical white paper” and you can open or save.
OR
You can use this direct link: http://download.microsoft.com/download/8/3/6/8360731A-A27C-4684-BC88-FC7B5849A133/SQL_Server_2016_In_Memory_OLTP_White_Paper.pdf
It’s 90 pages long, so you might reserve it for beach reading.