I just posted a dsicussion on the new system hopefully others will contribute to it. In the meantime you can check out the settings I used.
As far as setting up a IKA chain, It’s still the same but there is one button that is new. (ChainLen =). see if it’s set at zero, if it is change it to how many bones are in your chain.
Example: an arm. Your have a bicep bone connected to a forearm bone. That would be 2 for the chain.
to setup the IKA_Solver:
Add a bone at the wrist end of the forearm, this will be the IKA solver. Make sure it’s not parented to any other bone. In Pose mode, select the forearm, then add an IKA solver constraint, in the Ob slot, type in the name of your armature. If you did not change it , then it’s name defaulted to Armature, next in the BO slot, name the controlling bone. (It;s the one you added at the wrist)
Now grab this bone move it, the chain will follow it.