Github user davebshow commented on the issue:
https://github.com/apache/tinkerpop/pull/478
After actually thinking about this, the type of future returned will depend
on the underlying `RemoteConnection` implementation. A call to the
method`promise` will cause a `(async)traversal_strategy` to call `apply`, the
result of this depends on the underlying remote connection, and all the GLV has
to do is pass the returned futures along to the end user. Therefore a Tornado
based driver would return a `tornado.concurrent.Future` etc. etc. Make sense?
Or am I missing something...?
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