OnDigital is changing its name to ITV digital, with a new "ITV Sport" channel which includes the Champions League, Nationwide League, and Worthless Cup games. Typically, the letter tries to suck subscribers in with the "special introductory" price of £6.99/month which covers both ITV Sport and a PPV "season ticket". But this only lasts 3 months following which this price will cover only ITV Sport, with the PPV being an extra £3/month.

They're dropping the OnSport channels which means fewer sports channels overall. It remains to be seen if the Champs League coverage will suffer as a result....
...thanks to Mick Champness for clarifying this. He rang ThingDigital and was told they'll continue to screen 2 champs league games simultaneously when necessary, using "ITV Text +" for the second match. So that's some good news anyway.