Some of the politicians like to say it'll be the same sort of system that's on mobile phones here. These have two characteristics -
1. The filter is full of holes
2. What's blocked is pretty arbitrary
For instance, I was at a music festival last year (Beautiful Days), and access to the online site map and festival schedule was blocked as 'adult' content. The festival itself was full of kids and teenagers (brought along by their parents) for whom the info would have been useful. To get around it, I installed Orbot (Tor for android), because they only care about censoring the web.