The CMUcam will definitely be back in the 2007 game.
Line-following has not part of an FRC game since 2004; it may or may not make a comeback. Even in 2003 and 2004 when there was line-following, very few teams were actually followed the line. The same can be said for the IR beacon in 2004.
Sound tracking is [highly] unlikely, because there is way too much variation on the acoustics of the different venues where FIRST competitions are held. In addition, FIRST competitions are loud enough as is - let's not intentionally make them louder.
Sonar/ultrasonic sensors are a possibility, but then again they've always been a possibility. There isn't anything too high-tech them, at least not nearly to the level of the CMUcam.
Accelerometers, gyros, and the encoders will be back. The trend over the past few years has been for FIRST to encourage use of "high-tech" sensors such as these.
If we have another year of a wide-open field, bumpers and anti-wedge rules will be back. If we have a field like 2004 or 2005, then you may see a relaxing of these rules and/or the elimination of bumpers.
Kitbot and KoP transmissions will be back.
Fuel cells will most likely not be part of the 2007 FRC game; this is why the Green Machine competition is a separate program this year.