Somewhere in this week.
Good question. The answer seems to be version 0.86.0.
1.0 or 1.1.
Again, it can be sooner as I haven't explored yet the difficulties of Ext JS 4 integration.
Another good question.
We must wait for 0.90.0 for purchase pricing details.
I can't say much for bundling as it depends on Sencha and their attitude towards this.
You can buy Ext JS 4.0 now and buy uniGUI without Ext JS bundled later. That's quite possible.