IMHO this is the most important thing that should be noted, maybe someone can add this link to the description/make it more prominent. A whole bunch of components were missing from @next version, now it seems they are finally here, so that means there is no blocker for guys needing to move to the new version, which in my opinion is awesome, with things like grids: https://material-ui-1dab0.firebaseapp.com/layout/grid and such that were/are not present in 0.17x and below.