Yeah, it was kinda sudden. Thankfully my friends made it in time before the patch hit.
Note that if you installed the patch already (switching region to US) and want to log back in to EU, you need to uninstall D3. Simply "downgrading" doesn't work (I learned that the hard way).
As of tomorrow you can still trade, but only via the AH. Let him/her pick a really stupid blue or yellow item with kinda "unique" numbers and put it up for whatever amount you want to give to your friend (+15%). Something like a rare belt with 897 thorns and 45 poison damage or whatever crap the vendor has to offer. Wait for 5 minutes until it becomes visible in AH search, search for it, buyout, done.