With these 2 raid nights, are they going to replace the Monday / Thursday current schedule? Something to think about since we may not have people who want to run 4 nights a week, and we may step over each other on raid IDs.
This is very true. I still plan on running Monday's and Thursday's. With all the new folks that need practice and gear, I'm willing to just farm our Naxx to get things rolling and help everyone along. (after Onyxia of course.. lol)

Yes, in 3.3 we can farm badges like crazy, but a single night of Naxx could potentially get an entire team up to ilvl 200/213, with badges to boot. (and some folks may need a base set of gear to get heroic farming sped up)