Well the silver lining for me, at least, is that I played with 2 MA relics (because of boots), which was -20 seconds. Bumping that up to 3 relics in the new system is -18 seconds, pretty close to what I had before.
Of course, everyone without the boots is COMPLETELY FUCKED because their 1 min Vendetta that lined up nicely with Vanish is now a 1:12 Vendetta.
Really fucking ridiculous to sneak something like this in at the last minute, Blizzard. Even last-minute nerfs to spells aren't as bad at this, because you can adjust your playstyle at any moment. Not everyone can just magically get 3 good relics in the space of a week, though. Here, you've effectively told Rogues "hope you had some backup relics in the bank otherwise GET FARMING LOL" with 1 week before the release of a raid.
Utterly ridiculous.