No idea how the progress is and what has been tested. But the new cloaks have been
causing a lot of trouble on the mods I've been testing them on.
Since I've not tried it here yet the only suggestion I have so far is this:
Slink
Here is how to add the invisible cloaks, from Craig Welburn, Bioware Live Team Programmer.
http://nwn.bioware.com/forums/viewtopic.html?topic=494958&forum=48
Unfortunately there is no NULL cloak option available in the 1.68 update.
Fortunately it is really easy to add one (if you know how to modify a 2da file).
Open up the cloakmodel.2da (you can find it in your 2dasource.zip file in the NWN install directory, or you can export it from the HotUPatch.bif using a tool like nwnexplorer).
Add a new "Invisible" or "NULL" cloak row and set all the data entries to 0 (except for the ENVMAP column which should be left as "default")..
Save your changes to the cloakmodel.2da.
Now put the new cloakmodel.2da in your module's hack pak (or throw it into override for testing).
Launch the toolset and select the new "Invisible" cloak model for your cloaks. When equipped the cloak wont show up on the creature.
Hope that helps,
Craig.