How very interesting - we bought a ton of those during 4E, but used them far less than I expected we would. So hard to separate and organize for quick grabbing. But man I loved the prettiness of 'em.
Your guess is as good as mine. The WotC D&D twitter account says more info will be coming soon via Twitch.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.
(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.