"Can I be happy that the Rev has another game annouced while at the same time suspecting that the developer's emphasis on the style suggets weak gameplay?"
I'd say that's an unfair statement. I'd be more concerned that it's a new developer than anything else, but who knows what they're capable of? Some of the best games of this generation were oozing with style, and a unique presentation is almost always indicative of an interesting (often great) game. People who are dedicated to making great games generally put the effort into making them look and feel equally good. Look at virtually any Nintendo title, the games are both fun and aesthetically appealing.
Some games have style but lack gameplay, like Eternal Darkness. Some might argue Killer 7. But I loved both of those games (especially Killer 7) anyway, even if the gameplay wasn't spectacular. The style and story was interesting enough to get me through the game, and left me with a feeling of satisfaction afterward.
Sadness has great potential, and it's fair to get excited about it. No reason to crush our dreams just yet, Ian.