I try to find the developing version 0.92, but I found for download only version "Inkscape 0.91+devel_64bit r14690" and in this one I did not found the mesh tool in the tool box...
I read that 0.92 is not yet released for test. Maybe I am wrong? Is there any place wher eI can find 0.92 for testing?

I make a post in the inkscape forums Board index General Inkscape Topics Inkscape Ideas , called " Gradient Mesh Tool - first results after testing"  with considerations of my test.
So I put here my comments, sustained also by pictures for proving what I mean to say.

I have 1 recommandation and 2 "bug comments" (or maybe I don't know how to handle the tool properly...) that I want to make.

1. Recommandation
It would be interesting to have the possibility to have a function that a allow the mesh tool to automatically pick up the color from the visible layers (except the working one, of course) for all / selected points. The layer from which the color is selected can be from underneath layers, or all layers, all VISIBLE layers, etc - this function can have more options. I spend a lot of time in "collecting" the color that I need from the underneath layers and this will really help

2. "Bug" number 1.
Sometimes when I try to move a handle, the lines disappear and I must use CTRL+Z to get them back (but I cannot move the handles, because ANY handle moved, provoke this issue). To be honnest, I don't know how I reach this situation, it is happening only for one of the objects I use.
See Picture Bug1

3. "Bug" number 2.
Objects created with this tool (the hidden gradient mesh tool) cannot be moved / flipped, etc. In fact, they can, but they became invisible...
See Picture Bug 2 (mouth original and duplicate the mouth then moved it - the square shows whre the duplicate mouth is, but it is invisible). I tried tu "move up" the object, I even hide all other layers - but unfortunately, the object remain invisible. It became invisible after the first action did to it - flip, move, rotate, etc.
This is annoying because I wanted to use the first eye asa a base for the second, but now I must re-draw it from scratch...

Pictures referred are attached - or see them in my post