gwt 2.0 jdo / jpa enhanced classes in App engine / Data Nucleus used for GWT-RPC calls to client side

I have seen some messages mentioning that with gwt 2.0 it is possible
now to transfer jdo domain objects on app engine / data nucleus to the
client side using standard gwt-rpc mechanism. But I could not find any
information regarding this in GWT documentation. So I would like to
know whether this works fine for a production application without
problems? and also if this is limited to JDO and does not support JPA
or we could also use JPA app engine domain objects with gwt-rpc?
I have been using GILEAD with JPA+ hibernate + MySQL for this and so
far encountered no problems. Gilead site mentions that it now supports
JPA + app engine but it cautions this feature is experimental and
should not be used for production applications. Does anyone using it?
Thanks!

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