Why is IE10 CP 64 Bit starting 32 bit processes for browsing?

On Windows 8 CP, you can start IE10 64 bit, as you could with the DP, by running:

C:\Program Files\Internet Explorer\iexplore.exe

By contrast, the 32 bit version is here:

C:\Program Files (x86)\Internet Explorer\iexplore.exe

So how come when you start the 64 bit IE10, does it start 32 bit processes for rendering the actual pages?  This is different from the IE10 in the DP, which ran all 64 bit.

If you have a 64 bit system, fire up the old Task Manager if you don't believe me.

-Noel