Confused about possible MR556 updates

I have been thinking about buying a MR556 but I have been holding off hoping that it would be updated/upgraded (A3 or A5???). At shot show I was under the impressions that the MR won't be updated anytime soon. Now I see that at other shows HK is showing an upgrade to a MR556A3. Is this coming to the US? At this point does anyone think that the MR556 in the US will get upgrade anytime soon? Should I wait for upgraded options? Has HK USA changed its story about upgrading the MR556?

Thanks