New site is goodlooking and also good new features.
But just 1 dissappointment for me is about surfing experience on website (same as old version.)
They could use  partial postbacks on many parts of site e.g. forum pagings 
like this one(navigate on the left tree):

https://help.arcgis.com/en/sdk/10.0/serveradf_net/conceptualhelp/index.html#/Common_Security_PassThrough/0002000001rt000000/ 

 however, thank for the rest of all.