I've gone ahead and completely redone the word lists for the various keyword/function/operator highlighters to be more representative of T-SQL. In general, what you see on Data Explorer should now be pretty consistent with what you'd see in SSMS.
The highlighter also doesn't respect T-SQL
[identifier] escaping at the moment, which is a regression of this issue.
I'm in the process of fixing that now. I've fixed this too, and added highlighting for Data Explorer input variables (
##variable:type?default##) for good measure.
Both fixes should go out in the next build > 2012.8.31.5, or shortly thereafter. Once they're live, let me know if you notice any remaining irregularities.