I am REALLY looking forward to NACL tomorrow.
Since NACL is played on the live servers, tomorrow's games will be the first games of high level teams adapting to the preseason changes that are streamed to the general audience. There's been a fair amount of information available to read up on things, but I think it should be very interesting to see people come up with new plans for trinket use and jungling.
Very likely there will be some things that won't last long, but it's also pretty likely teams will start to hit on plans that will become common practice for solo queue for the next month. There's just so much to see, with the changes to game flow and the new vision system.