Maybe it'll grow on me - but I'm not sure what I think about var in Java.
1. It's incomplete without val - I use final fields (local, or otherwise) all the time - although nobody wants Java to become Kotlin (well maybe capitalthree :p)
2. It's going to require more analysis on behalf of the IDE - and support might be dodgy for a while. (also, nobody wants IDEA to be any slower to import projects)