I'll stand by my original comments - nothing beats a phase-detection TTL system - any P&S I've touched has abysmal AF compared to an SLR. While IR/laser contrast pattern systems are even more accurate, they have a limited range, and phase-detect systems coupled with fast lenses will beat that in any low-light situation. I have no operational use for NightShots - I personally think it's a gimmick thrown in to appeal to the techie crowd. High ISO? Well, here's a good reason why I need a usable ISO 800 - I shoot low-light concerts and plays A LOT. Therefore, usable ISO 800 and above is key for me. I don't mind paying for good performance, but hands down, the 828 loses against the D100 already in this category, and most likely the D70 will improve on high ISO performance when it's released. It's disappointing that the 828 will let you shoot in total darkness, but won't do so at a reasonably high ISO that would let you freeze movement if necessary.
I think you need to frame the 828 versus the D70 question this way - if you already have a set of Nikkor AF or compatible lenses, there's no reason for you to go the Sony 828 - you can leverage the strength of 35mm SLR system - portability and interchangable lenses. Granted, the 828 is a very nice all-in-one solution, but it's not a competitor for the D70's market. If given a choice between an digital SLR and a high-end point & shoot, I'll go with the more flexible solution everytime.