Great question!

Nothing was deleted from the new CBK® compared to the old CBK®.  That simple.

Why am I saying this, how do I know this?  just like you I don't but ISC2 does, see an extract from their website FAQ below:

Q: Since the CISSP has changed from 10 to 8 domains, was some content deleted?

A: No. Content was not removed from the exam and/or training material, but rather refreshed and reorganized to include the most current information and best practices relevant to the global information security industry.

As you can see old resources are STILL 100% applicable to the new CBK plus a few more topics that were added as new topics.   I have a list of new topics available at: 

In short: it is still the same deck of card but it was shuffled once more.

Best regards