This is something that I honestly think everyone on this site has had stuck at the back of their minds, and so:
In the Hytale trailer, not to mention the gameplay OR even the screenshots, we see weapons being used many times, as well as armor.
However, what we do not see is a small green bar that becomes shorter and shorter until the tool/armor eventually breaks, which might actually be informing us:
There might actually not be any durability.
Now, in Minecraft, I feel they went a little over the top with the whole 'you use it, it breaks' thing that really is nothing like real life. Take shears, for instance. They literally break after 50 or so uses.
I would actually be fine with no durability, but I know there are some of you out there who would like durability; but as more and more Hytale gameplay is being released, it becomes more and more evident that there truly may be no breaking tools/armor.
I don't really know if there will or won't be any, but Hytale has released no clips that feature this, so there may in fact be none.