RDS2 is now official standard. For testing and commenting you can load the draft version from RDS-Forum homepage
The new RDS2 includes also the RBDS and UECP standards.
Receiver are available so as USB-Stick
Encoders are available e.g. from WorldCast systems tested in Paris (Radio France) and in 14. May 2019 in Budapest (NMHH Workshop)
In addition to the familiar 11.4 37-bit and 21-bit groups, RDS2 offers you additional payload volumes of up to 34.2 groups per second with 7 bytes (56 bits) of payload.
This is 14 kByte / Minute and enough for little pictures/Logos, Internet addresses, ODA Data (Open Data Application). Together wit a possible LTE interface (e.g. Smartphone or Car Radio) you have the best of two worlds Analog and Digital. Some newer encoders could implement it with a simple software update, so it's not a question of price whether the transmitters switch or stay behind.
The available receiver chip is a standard NXP TEF6688 with modified firmware, this shows that the receiver market is also not hindered by high hurdles.