Nutanix is refreshing their appliances to G7 generation hardware which will eventually replace G6 generation hardware. Transition is done in phases, first platforms to get G7 refresh are already released multi-node models NX-1065-G7, NX-3060-G7 and NX-8035-G7, followed by single-node models NX-3155G-G7, NX-8155-G7. Additionally single node NX-8150-G7 reappears in the model lineup.
The fate of remaining G6 platforms NX-1175S-G6, NX-3170-G6 and NX-5155-G6 has not been released yet. I would expect them to be updated in some form or other, but you never know until they are released, some might be dropped or altered. If these models are crucial to your future Nutanix projects, please check the availability and specifications for G7 variants from your local Nutanix Rep.
The official Nutanix stencils will be updated following new hardware releases. The latest stencil package can be found from Visiocafe. The initial update will include new NX-1065-G7, NX-3060-G7 and NX-8035-G7 shapes, more shapes will be released as time goes on. This stencil release also includes fixes for some scaling issues, namely using Nutanix shapes with Viso “No Scale” page settings or Visio “Blank drawing” templates.