They haven't been specific about pricing yet but they'd be crazy if they didn't offer a discount on the matchday pricing. I found the original presentation I made to the club on this, which would have been in late 2018/early 2019.
Funnily enough I used the £150 figure as an illustration of an upfront payment, which they've used. My proposal was to knock £10 off the match day price, meaning that if you attended 15 or more games, you wouldn't pay any more over the season. Thinking about it though, it should be a little bit more so that if you go to all 19 games, you'd pay less than the matchday price for all 19 games, but more than the equivalent season card price. Hopefully the pricing will reflect that.