In this article at Game Daily, author Greg Atkinson claims that two things have been confirmed about Bethesda's Fallout 3: SPECIAL will return, and previous characters from the series will make appearances. In DAC's interview with Todd Howard back in 2005, we confirmed that Bethesda would be using SPECIAL:
Will you be using the SPECIAL system in Fallout 3?
Yes, we have rights to it and plan on using it.
Atkinson doesn't offer any citations or proof for the other claim, but it may still be the case as Bethesda has recently shown a penchant for revealing much more to "main stream" sites and mags.
The two most major and confirmed announcements about the game were a
relief. Fallout 3 will continue to use the series' SPECIAL (i.e.
Strength, Perception, Endurance, Charisma, Intelligence, Agility, and
Luck) character attribute system. We guess the system will contain a
few small modifications, but the main character system will be in
place. Secondly, characters from previous games will make return
appearances; they would need to travel from Southern California (the
setting for the first two games) to Washington, D.C., the major
metropolitan area in the game. This change seems like a good move for
Bethesda since it will help keep the game fresh and allow the
development team to create a new history for the series (and cheap
assets since the developer is located a few miles from the D.C. border).
I guess we'll have to wait until next week's press event to learn more.