Haven't heard of any change in Revive rate, though stops do seem slower to act when you spin.. guess all you can do is keep spinning
The other week it seemed like I couldn't get an egg for the life of me, I had to spin for a bit before eggs started poppin, like in the afternoon they started comin
Thankfully I also recently hatched a good Abra and Slowpoke, finding good ones is hard. Alakazam and Slowking are on deck, got a King's Rock on my spin (need another, what with Politoed)