I'll bet this has been blogged about quite a bit today, but maybe it is worth posting again: Adobe CS3 will be formally announced on March 27th. I found this post on an official Adobe blog that speaks to the release. One thing to note is that while the apps will be offically announced on the 27th, they won't actually be shipping until later in the Spring. Here's hoping that they release a complete feature listing on the 27th.
As a side note, I noticed my beta of Fireworks CS3 expired today, so this date may have been planned for some time now.
[Update: a new build of Fireworks was released with an extended cutoff date, I just hadn't checked or downloaded it.]