I submitted mine today with the new site, same as the OP. I'm waiting for the result it's 'pending' ....
I also noticed what he said about the PDF TM47 that is sent to your email after submission...it has a blank space where arrival card number/non O tickbox/arrival by details should be as they don't ask for it in the form. They do ask for your visa expiry date in the submission form but it's not labelled as 'Required Red *' but I filled it in anyway ( I filled everything)
Old system was working fine no problems for me last 2 submissions successful. Submitted exact address and was very careful no mistakes, screenshotted everything on this new system... Hopefully get an email 'approved' in 24 hours, old system was approving very fast last time