What will be new in upcoming Maxwell Render V3? See the webinar video and read text and you will have that answer.
Network render improvements in V3 is mostly internal, new version will be more stable and there is no longer a need for Xserver on Linux, becouse nogui flag works as a true no gui application.
Maxwell Render V3 will support Maya fluids, but Field3D and OpenVDB support will be added soon after V3. Maxwell Render plugins will also be available at release date. There have been some improvements to thin SSS, so V3 could work better with emitters now. Also there are new spherical lens so you can render 360 degree scenes.
For now we now that Maxwell can’t run on Intel’s Xeon Phi, but in near future maybe will.