Why the early drop?
My guess is that Apple is anticipating a lot of work for their servers on Friday afternoon as a million or so people activate their new iPad 2s. And so rather than have them competing for bandwidth with millions of iPad 1 owners who are updating to OS 4.3 on the same day, they pushed the drop date up by 48 hours.
By the way, I just updated to 4.3, and it is appreciably faster, especially on graphics heavy webpages.
My guess is that Apple is anticipating a lot of work for their servers on Friday afternoon as a million or so people activate their new iPad 2s. And so rather than have them competing for bandwidth with millions of iPad 1 owners who are updating to OS 4.3 on the same day, they pushed the drop date up by 48 hours.
By the way, I just updated to 4.3, and it is appreciably faster, especially on graphics heavy webpages.