Not long after Xiaomi released their kernel sources, good things (read: latest Android builds) have started happening!
Thanks to sources being released, 3rd party devs can now build stock Android ROMs for Xiaomi phones from the comfort of their homes. Three Xiaomi devices, namely the Mi2, Mi2S and the Mi2A, are among the ones to receive Android v4.4.1 ROMs. However, there are quite a few bugs in the current ROMs, and it is advised that you wait for a more stable version before trying it out. The more adventurous among us can, however, give it a go here. Not long ago, another 3rd party dev had managed to port an Android v4.4 KitKat ROM to the Mi2.
If you do decide to try it out, let us know of your experience in the comments below!