"Mystery firm Creative is selling a "limited edition" version of the Audigy 4 on its web site. But there's not a great deal to distinguish it, as far as we can see, from Audigy 2. However, a major distinguishing feature consists of the words "limited edition". Presumably the kit is signed personally by the engineers that put the machinery together."
Wow, that almost went unnoticed. Some of the features include ultra-high quality DACs and an External I/O Hub which provides 6 Stereo Inputs/6 Stereo Outputs, amazingly clean recording of six channels at 24-bit/96kHz with low latency ASIO 2.0 support There isn't much more detail but this is awesome news. I wonder why they jump-skipped over Audigy 3. Maybe they going with the 2^n naming scheme. ;-)