Where can I see the new f-gas regulation?

The original F-gas Regulation, adopted in 2006, is being replaced by a new Regulation adopted in 2014 which applies from 1 January 2015. The new f-gas regulation is available on the European Commission website at this link.

I have heard that the use of R404A for servicing is banned from 2020, is this true?

Yes the new F Gas Legislation that came into force on 1st January 2015 prohibits the service and maintenance of stationary refrigeration systems with virgin refrigerant with a GWP equal to or greater than 2500, for systems where the charge is greater than 40T CO2 equivalent (10.2kg of R-404A).