While the new RR spell may initially still be locked away behind 10-chest tournament and/or 'buy with diamonds', I fully expect that it will eventually show up as a possible prize in some of the larger events.
In fact, I wouldn't be surprised to see it show up in this year's Fall event, if it's released by say July 1, or else by the Winter event as long as we get it sometime before Oct...
Inno initially gave us the Reno kit in the 2014 easter event, & 1-up kits came with the new fall 2016 event.
While initially limited in release, (basically being 'event only'), they now crop up regularly in;
- every single 'main' event (carnival, spring, summer, fall, Halloween, winter)
- special events (ie: soccer cup event)
- occasionally during Historical Quest events
- possible prizes on the later levels of the weekly Guild Expeditions
- possible prize for a Jade Relic obtained as a rare relic via the 'Temple of Relics' GB during guild expeditions
- possible Daily Challenge reward
Lots of ways to obtain these items now, though the 'best' way is still during the big main seasonal events and the special events...
It make take some extra time, but considering how FoE now handles their 2 upgrade items, we can probably expect this new spell to eventually see much wider release.