The 9150 apparently comes with a 500 GB drive already installed in the drive bay.
I've no idea if they'll also sell the 9000 without a drive or whether they've ditched that idea and gone for charging an extra 100 quid for 40 quid's worth of hard drive.
Hope you can buy barebones because I'd rather fill the bay with 1.5TB of loveliness.
I don't think anyone can tell you what chipset it uses for sure but it does pass through TrueHD and DTS-MA.
Not sure what it will do compared to a popcorn hour but it may be worth looking at depending on how "slick" the interface is for "Her In Doors" usage.
And it does have wireless N built in. It will be interesting to see if anyone can manage wireless streaming of a Blu-ray rip, though.