The only thing I've read that is related to this is the stickied A06 upgrade
thread. Which is alot to read now. I have found no reason to upgrade my rom yet so I haven't. I believe the few things you gain is a new BT stack(which that can be upgraded on your A05) and the ability to connect to wifi even if your battery is <20%. Downside I remember is battery lifetime is shortened. But this is only what I remember.