I'm using vboyz version of the DCD ROM on my XV6800. Runs great so far.

I think this is going to be like the 6700 ROMs. You will be able to use pieces of other carrier ROMs. There are some things that will need to be specific though.

How to tether on the verizon 6800
 

1. Make the following registry changes:

HKLM\Software\OEM\WMODEM

add DWORD "CheckProfile"=0
set DWORD "Multi-NAI"=0
set DWORD "WModemDUN"=0

2. Start Modem Link (Open then select "Start" from the menu) with data disconnected and USB unplugged.

3. Connect USB. Windows will automatically download and install the appropriate drivers (you may have to click through some UAC prompts first to confirm).

4. Set up a new dialup connection using HTC USB Modem. Number is #777, user name is your phone number, and password is "vzw" without the quotes.

as far as using the htcamaerica home page for software updates, it wont be posted there afaik, but rather on audiovox's web site, just like the last 2 htc phones that were released on vzw, the 6600 and the 6700.

Ok, I ended up just installing the HTC Home Plugin from Blas's link. That seemed to work like a charm. THanks!
I also installed the HTC Touch Cube onto my 6700 to play around with it, and indeed it worked well also. Not sure if I want it on the 6800 though, i'm a little underwhelmed by its functionality. I think internet sharing is already active on the XV6800, at least I see a link for it in the programs.

well, all the credit for that link i posted goes to duttythroy of xda developers. there's a load of kaiser apps on the link he posted in that forum which works on very much anything that works with WM5 and so on up. but there's a plethora of other possibilities you could do, even before the XV6800... like touch apps. i have them on my mogul, and they're one hander friendly.