Today in Ask Wizards:
http://www.wizards.com/default.asp?x=mtgcom/askwizards/0406 "In spite of these numbers we decided not to remove upkeep from Magic, at the time, but knew we would eventually have to. It is unlikely that upkeep will still be a part of Magic by early 2007.
This is another potentially huge announcement leaked to the Magic community through Ask Wizards in just a few days. Obvioiusly, this would mean a huge Oracle overhaul rendering cards like Eon Hub completely obsolete and could affect the way that so many decks in vintage work.
I would imagine there would still be an upkeep-like phase for the triggers like Smokestack and Oath...but this annoucnement is going to make my head asplode with possibilites.