Can we have after split kopete in Fedora and kopete-freeworld built with mediastreamer in RPMFusion (with enabled voice/video)?

maybe, but efforts to implement that are largely orthogonal to split packaging.

Here's my first try,
http://rdieter.fedorapeople.org/rpms/kdenetwork/

and scratch build:
http://koji.fedoraproject.org/koji/taskinfo?taskID=3221406

please look it over, if you get a chance.

The problem with kopete-freeworld is that you have to replace the whole Kopete.

kdenetwork-kopete-freeworld can have Conflicts: kdenetwork-kopete
as in audacity-freeworld http://cvs.rpmfusion.org/viewvc/*checkout*/rpms/audacity-freeworld/devel/audacity-freeworld.spec?revision=1.18&root=free

Main kdenetwork package instead Requires: kdenetwork-kopete can require something virtually provided in both kdenetwork-kopete and kdenetwork-kopete-freeworld packages.

committed.