First off, Radiance is not going away...in fact, it's becoming absolutely necessary for all of the high level instance, and mandatory for raids. I'm not happy about that (the term "radiance gating" is what the devs call this), however getting rad gear is now much MUCH easier.
Radiance gear is now bought by yet another currency, Medallions. There's medallions for the +10 stuff and ones you can trade your elf stones from HoM/WW Hard Mode for different Medallions for +15 stuff. In SoM, you can earn Rad medallions on a variety of skirmishes. There's an example on the raiding boards about how, if you were determined, 2 people could get completely kitted out for raiding (in the newest, best rad gear) in 4 hours just running one particular skirmish.
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