Got to play on it for a few minutes today ... Krivoi Rog is absolutely gorgeous.
As for the rest of the graphics stuff ... someone mentioned earlier on in this thread that it looks like a whole new game, and they could not have been more right. It's like a night and day difference, and if anything the performance is better. I was getting 65-70 fps on standard RO, with the beta I'm getting 75-80 fps, with everything maxed on a GeForce 7600 GT.
Even the other maps are just stunningly beautiful. I can't even describe what a difference it is. I'm not sure if it's the bloom, the FSAA, the Anisotropic filtering or what ... but it's just amazing.
Oh - and Yoshi's not the problem, really. It's Ramm-Jaeger. Keep him away from the damned Tigers!