I'm not in the know but I would be very surprised if Froyo doesn't come to the Incredible considering it is only a couple of months old and is still very new in the Verizon stable of phones. Even if they discontinue selling it they've got a tremendous number of these handsets out there. That all being said I was not really all that excited about the 2.2 upgrade until I read this link. Particularly the speed increases and the wifi hotspot sound cool to me, however, I'll bet Verizon cripples the WiFI hot spot because they have their own offering for this.
Google unveils 10 huge improvements in 'FroYo,' Android 2.2 | Software News - Betanews
App Autoupdating will also be very cool because the last time I had to update I had 25 apps that needed it and it took like 75 taps to update them all.
Whenever it comes I also hope it doesn't wipe the phone although that's not that big of a deal these days with most of our data being in the cloud.