nRF5 SDK for Mesh v3.2.0 was developed for and tested with nRF5 SDK v15.2 and for most SoftDevices the SoftDevice version is 6.1.1. See the compatibility section of the documentation for details.
The changes from nRF5 SDK v15 to v16 are mainly change of SoftDevices from v6.x.x to v7.x.x, but you need to have a thorough look at release notes and migration guides for the nRF5 SDK if you want to port yourself. From what I understand we are planning on the next nRF5 SDK for Mesh release to be compatible with nRF5 SDK v16, so it may be worth waiting for a new release. For definite answers regarding future releases and roadmaps, please contact our regional sales manager for your area.
