[Sorry] There Won't Be A MicroSD Card Slot In The Nexus 5X Or 6P
In the case of the Nexus 6P, this isn't a huge deal. You can get as much as 128GB in that phone, which is more than enough for most people. However, the Nexus 5X will start at 16GB. Some buyers will even turn up their nose at 32GB in a phone with no expandable storage, and that's the maximum for the 5X. This is the direction Google is going, though.