Well, I think I'm gonna jump on this bandwagon too. I love the gameplay of Lego games and the franchises available here are amazing. On top of that, I've been contemplating collecting some of the Lego stuff for a while (Star Wars, Ghostbuster...) but I could never get myself to spend the money since they would just sit there and do nothing after I build them. This game will give me the little push I need to buy some lego!
And I am also unsure of my Infinity future. Contrary to most of you here, I do not play in the Toy Box, AT ALL! The only way I use the toy box only figures is in the minigames (Kyln and the Brave one). So if I can get way more campaign style gameplay in the Lego game, I think that will be the one I will go with and play the most.