When will increase arc wiring and automatic routing function for kicad？
Well. If you can supply a patch for it, it can be included very soon. 
Or interest any developer(s) by report a Whishlist or Blueprint via Lauchpad.
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KiCad has a very nice push and shove router in OpenGL mode.
If you want a conventional autorouter, there is the external FreeRouting standalone autorouter, that works well with KiCad https://github.com/freerouting/freerouting
Arc in traces are being evaluated ATM because of its use in RF boards
https://lists.launchpad.net/kicad-developers/msg26202.html