Well, not quite a bug, but I noticed delays when it comes to already-paired devices auto connection when activated.
E.g., when using my Xperia 10 ii (4.4.0.64), my BT FreeBuds 3 are connected to the device 1 sec after I activate them.
Now, on my Xperia 10 iii, it takes longer to connect (4+ secs), and sometimes I must go to BT settings and manually connect them (not pair them, just connect them).
Again, this is not exactly a bug, but it makes things a bit awkward when, e.g., trying to reply to an incoming call.
Anybody else experiences this?