A bearingless rotor is the same as a hingeless rotor, in most conversations. Instead of hinges allowing the blades to lag and flap, a section of the rotor itself is designed to bend under the loads. These rotor systems are sometimes called rigid rotors too but by design they are meant to bend!
The Lynx and the Bo105 were the first production types to get theses kind of systems, I think. This type of rotor system gives a much more agile manouevrability, a quicker response and higher control power but with the drawbacks of higher vibration, as the blade is 'rigidly' attached to the hub and some stability issues.
Also, I dont think the Commanche is to replace the Apache, I think its role is as an advanced scout.
SEL