As someone that puts machines out on site, the biggest advancement i want to see is online monitoring/reports and contactless payment (or at least a machine that is plug and play for such a system). I was really hopeful that Scorebit would bring this as they work across systems but with their monthly subscription model as it stands this is a non starter.
Deeproot have some interesting ideas in the pipeline, but no one will care if the games are crap. As they haven't taken a penny in deposits I couldn't care less when they are available, I will judge as always when my hands are on the games.
The MOST important factor is fun. All the rest is dressing and won't matter if they get this right.