Hi all,
I was coming to tell that today's build was going to please you, seems that dragos beat me to it.
So as of build 15.5.675, FBX export does support blend shapes. It does unfortunately come with a few limitations, as the FBX file format is a bit rigid compared to what can be done in Houdini. If you don't have blenshapes after export, you might need to force their export, but doing so will ignore all the nodes that modifies the geometry after the blendshapes.
Also for UE, be sure to export using the FBX201400 export, as UE cannot read FBX201600 properly.
Some more details about the blendshapes export can be found
here [
sidefx.com]