Not to rain on everyone's parade, but I'm highly skeptical. I've got the latest seed of Leopard, and it's still not even close to ready for prime time.
That's not in any way an insult to Apple or Leopard -- it's a beta, it's not supposed to be ready for prime time yet. It's going to be a fantastic OS when it's done, but I just don't see it getting patched up to release quality in the next month. I'm under NDA, so I can't go down the list of all the things that aren't working yet, but trust me there are some pretty simple and fundamental things which just don't work at all.
Also, we're still in the dark on the "top secret" features. One of them is assuredly ZFS -- I suppose I can talk about this since it has been so thoroughly leaked -- but that doesn't work at all right now either. The hooks are obviously there, you can attempt to format a volume as ZFS, but after scores of attempts I have never managed to create a working ZFS volume. In the current seed it doesn't even try, it just errors out immediately.
Now, consider a March release which includes ZFS. Even if they finished the ZFS implementation today, they've got four or five weeks to test it. ZFS is an incredibly complex beast and errors in the implementation would be catastrophic -- at worst, complete loss of all of your data. And when do developers get their hands on it? The current seed has a non-working implementation. If Apple is going to give us the chance to make sure that the new filesystem doesn't cause any compatibility problems between now and March, we're going to need to see a new seed with ZFS support really soon.
Then, what about resolution independence? We know it's coming, Quartz Debug lets us test it, but there is no "real" UI in the system to access it and many of Apple's own applications don't work properly with it. As a programmer myself, I'll be highly impressed if they get resolution independence working properly in the next few weeks.
A March release is possible -- I would be thrilled to have to eat my words on this -- but I am skeptical.