Farshad,
Just a little comment, not sure you remember our talk about interface, but this Ext JS 5 is exactly what I am looking for. It is the "web flat style" implemented in the correct manner.
I certainly know you are busy, but I would recommend to put some priority on release this version of Ext JS, at least in a compatibility mode, where we could take the visual advancement benefit at least. I can tell you that this will be a major marketing step for you (and for me as a developer).
Thanks
Eduardo