will ad enhanced accounts get upgrades as well ?
All the servers for ad-free and ad-enhanced are being moved.
Also ad-free and ad-enhanced accounts will reside on the same servers which will make account management easier and the ad-enhanced accounts more stable.
If you allready have ad-enhanced you don't need to do anything, if you want to signup for ad-enhanced after the new site goes live you have to signup for ad-free, put the ads on your site and then request a free upgrade to ad-enhanced - this will help to stop people abusing the ad-enhanced packages.
If you look on the forums you will find all this infomation
Hope this answers your question