Well, GWT uses Eclipse's JDT (a patched version AFAIK), so it would first 
have to be updated to a version that supports Java 7, and then GWT code 
updated to support the changes (such as mapping "switch on strings" to the 
same "switch on strings" construct in JavaScript).
…but Eclipse's JDT support for Java7 is still in beta, so…
See http://wiki.eclipse.org/JDT/Eclipse_Java_7_Support_(BETA) and 
http://wiki.eclipse.org/JDT_Core/Java7

Also, GWT added support for Java 5 when Java 1.4 reached EOL, and Java 6 was 
already released, and GWT does not officially support Java 6 (that's going 
to change, and a few features are already there, such as @Override on 
implementations of interface methods, and String#isEmpty); let's hope it'll 
be faster for Java 7, but don't be too impatient IMO.

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