I have played a bit with the CS at the local store, and I have to say, although there are some things I don't like about it, overall I like it more than the IB. I've played about an equal amount of time with both systems.
The problem with /systems I believe, is that Marklin and ESU are no longer working together, and things just take a lot more time for Marklin to do. They just don't have the experience making Digital equipment to do it in a short time (remember that the original Motorola was designed and built by Lenz.) On top of that, most CS features were promised during the Marklin-ESU cooperation, and I'm sure when they announced everything, they more or less believed the could deliver everything on time. With all that's happened with the ESU breakup and the new ownership etc, I'd expect delays.
Another thing, when the first version of the IB came out, it lacked a lot of promised features as well. It wasn't a complete system, it became one over time. IB updates haven't always been on time, and the latest update has been rumoured to be released "soon" for many months now. A software developer at Uhlenbrock has even claimed on a forum a while back that the version 2 software would "definately" be out in march. Uhlenbrock is at the moment very quiet about any IB upgrade related to mfx.
Of course, people might say they don't care about mfx and/or plug and play, but just because you don't care about it, doesn't mean others don't. Right now, of all the digital systems available, Marklin/Trix Systems is BY FAR the easiest to get into, and it is BY FAR the most interesting for kids who like trains but like computers a bit more. The CS is basically a small computer, and the touchscreen, even though it's low quality, will attract kids. Also, the MS has the form factor of a handheld console, something many kids are used to having in their hands. In all, that's a good thing for MRR in general, since if no kids get started in MRR, MRR will die out in a few generations.
Maybe the CS isn't the most complete digital system right now, but it's a great start for those new to it all. And in time I'm sure the updates will come, and with it computer control amongst other things. Last, if the CS is so bad, and the touchscreen unnecesary, ESU and Viessmann wouldn't have been so quick to announce their own versions. Remember that not everyone has (or wants) a computer to control their layout.
On a sidenote, I don't have either CS or IB, but used both. I do have an MS, which I think is brilliant, and hasn't given me any problems at all. Which digital system am I buying next? Most probably Lenz.
Now I'll shut up about this whole pointless, waste-of-time discussion ;)