I just noticed that new firmware for the XA 20 has been released on 4/30/14:
Canon U.S.A. : Professional Imaging Products : XA20 (http://www.usa.canon.com/cusa/professional/products/professional_cameras/hd_video_cameras/xa20#DriversAndSoftware)
Here's a little more info about it:
http://support-au.canon.com.au/contents/AU/EN/0400138202.html
Doesn't look like a real big deal.
I was hoping for some more radical fixes