Yup, this be a thread for collected info from all those who now have the mod tools and can view the changes to the stats made in 1.3. I'm gonna get the ball rolling.
The Big Mek cost increase is horribly severe. Each upgrade adds 15 seconds to his build time, so with all 3 researches he ends up taking nearly 1:30 to build, half again as long as the WARBOSS for gods sake.
Horror req cost is down 1/6th, power cost is down 1/4th, and hp and base damage are down 1/5th. Penetration is same across the board. So yeah, they're now slightly less req and pop efficient, but slightly more power efficient. Still excellent units in my books.
NL power klaw is basically 3/8 of the power of the Nobz Squad version, still a bit odd as they're leaders and all but quite fair considering that its a one off payment.
Fire Prism is almost as horrible as always. The blast radius is down from 10 to 8, and the shurikens do half damage to heavy_infantry_med. That is THE only change. Orks are completely fucked against this thing still, luckily it comes out later now. Marines may fare better but personally I doubt it. That blast radius needs to come down to at most 5.
Cultists have got a literally astounding set of buffs. Base cultist build time is now just over 3 SECONDS. Yup, those whiny buggers now build up damn quickly. Hp is up to 125 from 90, and melee damage is up by almost 50%. These guys are quite the little meatshields now.
Trukks... a bit of heartening news here, the Trukk damage nerf is close to nonexistant. Base damage is the same, penetration has gone down 1/12th against Infantry_high (hardly going to cripple you) and about 1/3rd vs Infantry_Low (builders who by and large cant fight back) and Infantry_Med (Guardians, Scouts, and Cultists, who to be honest you'll mow down even with the nerf). So yes, trukks remain very good weapons and I expect to see them replacing Trakks in many Ork arsenals with the latter having been pushed back.
Unfortunately that good news doesn't extend to the Mega Blaster. Damage for the MB is now down to 1/4 of its 1.2 value. While not exactly useless the MB is hardly a weapon to inspire fear in anything much any more.
Finally, scouts. The scout damage nerf is actually very minor, maybe 1/8th less damage to the light infantry armours. Whats really crippling scouts is the accuracy loss on the move, but while stationary they're almost as powerful as ever.