Since the latest update notice on POL mentions mythic equipment I can only assume that come November we'll see the RME update go live. This coupled with Matsui's post of offering harder versions of fights from older content I wonder if perhaps it'll be tied into upgrading the former ultimate weapons.
Although I wonder if perhaps they'll shift Relic upgrades to any revamped WotG fights since they relatively recently revamped Dynamis content leaving any WotG fights such as Fiat Lux the only reasonable alternative. Granted this is assuming they don't just slap RME upgrading onto Adoulin content.
So what would you prefer? Adoulin content tied upgrades or would you prefer some old content given a new difficulty to enhance your weapons such as say revamped ToAU Kings or even the vanilla 3 Beastmen Kings. I suppose Empyrean Weapons could be tied to VW (but that's just gonna end in tears I think given the current server populations) or simply Legion-esque waves of the Empy weapon path NMs.
Whatever they do end up doing though I hope it's 6man hard mode fights. However since Matsui mentioned different modes of difficulty able to be selected perhaps a higher allotment of players as the difficulty rises that way those lucky enough to still roll deep with their friends can assist one another. Maybe have the lower difficulties require more repeat wins.