Is there anybody who is already working on it?
To my knowledge there is no active work being done with any cmake ports. With that said, the following were started but have been dormant for a while:
tdemultimedia tdenetwork tdesdk tdewebdev amarok kpilot tde-systemsettings
The most complete are tdenetwork, tdesdk, and amarok. Check the bug tracker for possible related bug reports, such as 818 for amarok. Although not explicit, many bug reports are build issues and will help with completing cmake ports.
If you have experience with porting to cmake from automake, or you hope to gain that experience, we need a wiki how-to to guide folks with how to proceed. There are some automation tools, but to my understanding they are incomplete. One way or another, a wiki how-to would open doors toward expediting cmake ports.
If English is not your native language, I will help edit any such how-to. :)
Darrell