BitThink was estimating the next daily mining dividend probably ... but, yeah, next difficulty will be around 87M ... more than 30% increase.
Yes, I mean daily dividend. Mine is a very rough guess based on the curve of http://bitcoin.sipa.be/. I think yours are from http://bitcoindifficulty.com/? 
I use Allchains.info as well, it's not pretty but it's a great resource!