Over all the years of it's production, from Japan to the USA and back again, Mother Honda have been masters of keeping a lid on what they are doing. We have had people speculating about all sorts of changes that Honda are apparently going to make every year and rarely are the rumours even remotely accurate.
We have had folks saying that Honda were issuing a 2 ltr engine and they have been going to do that, since around about when they brought the 1800 out in 2001.
So really, your guess is as good as anyone's, personally I doubt there will be major change, but that is just my guess and I would not have been able to guess the changes for the 2011 model that we now see.
The BMW is indeed an amazing machine, blessed with power and packed with goodies, but then again I have heard some less than favourable reports filtering through, more about the BMW supply chain and service, than any particular fault with the bikes themselves.
I guess though that the end of the day, it is good that there are bikes around to suit everyone. The 1800 Goldwing is more than quick enough for me, it out accelerates most four wheeled vehicles, so can hardly be considered lacking and where it is legal to do so, it has a very fast top end, if you need more, then I doubt a touring machine is for you, sports tourer comes to mind more.
Do let us know here if you do get involved in trying out the Beemer, we would always welcome the report.