It doesn't matter what the url is. It asks you to login to *your* passport, and then loads the appropriate MSN Today. Regardless of the url you use. As such, if your passport's MSN Today hasn't been updated, then the only way you'll see the new MSN Today is by waiting or using someone elses passport details (who have had their passport's MSN Today updated).
Edit: Disregard what I said above, I seem to have found a way around it.
The updated version of MSN Today is located on a different sub-domain name. Rather than msntoday.msn... it's now located at t.msn...
Here's the direct url:
http://t.msn.com/en-us/default.aspx
/ –
