Java highlighting difference
I don't know what the exact rules was, but in the old highlighting any word in the Java code starting with a capital letter was highlighted.
I found this a nice feature since class names should start with a capital letter, so class names would stand out from variable names in the code.
Of course there was an issue when people didn't follow Java conventions, but overall I found the code easier to read.
In the new highlighting there isn't any difference between capitalized or uncapitalize words, so class names and variables names all appear the same.