Although it seemed to be stagnant, the development of Cinnamon continues active and interesting changes will be coming soon that we can already see in the version available in Github.
One of the novelties is Cinnamon 2D, which looks exactly like the 3D version but of course it does not have effects and must run on all those computers that until now could not run the current version of this Shell. But this won't be the only change we'll see Cinnamon It will also show us the name of the Desks and add (at last) the option to configure the panel height.
Do you want more? Well there is more. They are added in the preferences of Cinnamon the option to install / remove themes, applets and extensions. It will be used metacity as a window manager if it crashes Muffin and something that many will love: Cinnamon will have support for Tiling (fill, grid .. etc).
And here the new features do not stop, so you can see that Linux Mint keep betting heavily on Cinnamon, something that users like me appreciate for when the current alternatives no longer convince us 
Source: @ Webupd8