Mystic Balance nullifies the Piercing Wand's penalty. That and the -3 cost reduction for WEYTWUT make it if anything even more overpowered for fireball strategies (although Wizards are feeling rather put off by Mystera's current revision, which is unfortunate because Wizards don't have a lot of great deity options). For those who aren't making full use of the new and improved CYDSTEPP.
And for what it's worth, I'll lend my vote to the "GG was fine as he was" camp. I don't really get the rationale for the change; if you'd asked me, the issue was more that most of the other deities needed to be buffed a bit and/or made less overspecialized. GG's boons have all been weakened substantially since his initial beta form, based on his rate of piety accumulation and penalties. If he's going to become stingier with piety (and stingier in a rather incomprehensible way, IMO) then his boons should go back to being all-powerful, because right now they're just not worth it (I'm not even sure how it's possible to get Enlightenment anymore without doing the Binlor/BLUDTOPOWA/desecration trick or something similar). But I think it would be better just to revert him to the prior update. If that's still not cranky enough for you, my suggestion would be removing the +5 piety on level up and increasing piety from potion conversion back to +5 (that was he doles out less piety in the normal course of play and rewards players who make an early commitment to his ways).