Similar to what some other companies are doing in this price range, it's likely that an Education system will include additional stuff (software, etc) vs the traditional model of a 5-15 point discount. We talked about included the higher end version of New Blue, possibly an NLE program. More as it develops.
On adding stuff, the box is built as an appliance so opening/adding/modifying is not part of the deal. But, we did anticipate the desire for additional storage for instance and there are tons of USB3 ports including a USB-C connector to use all kinds of portable/removable devices including SSD storage boxes.