Hi Ed,
I think a number of us have asked Garmin that same question the last week or two.....and we just can't tell. I figure that whatever I guess will be wrong (because I usually am) - if I tell people that it'll happen then it won't, and if I tell them it won't then it will. There are a lot of rebates from most of the EFIS companies (Dynon, AFS, GRT and Garmin) all have rebates that are due to expire so I can't get a good handle on any of them enough to say with any authority either way.
I know there are a number of people in the same position as you are, but I don't think any of us have a good answer just yet and I wish I had a better answer for you, but we are indeed watching!
Cheers,
Stein