XDA member CookieMonster found this bit of code in the latest Sense 2.5 (1922):

if HomeMachineStatus.WM7Device.Value then
IsWindowsMobile7Device = true
PredefineItem = 1
HomeItemCollection = HomeManager:GetHomeCollection(1)
else
IsWindowsMobile7Device = false
PredefineItem = 0
HomeItemCollection = HomeManager:GetHomeCollection()
end

Considering we have a pretty good idea that the HD2 is getting WM7 and Sense 2.5 (1922) is designed for the T-Mobile HD2, well you can see how HTC is already playing with and planning to cover up WM7.
Of course we know MSFT has no issue with this and in fact encourages such practice, plus it's not like you can't turn off Sense to return to the WM UI. Still, it's an interesting tidbit for the future.

So, It looks like HTC is planning on WM7 actually being a reality...
But I am pretty sure we will NEVER see an Official release for the TP2 since it doesn't have capacitive touch, and that looks to be a requirement.