We're still working on it. We should finalise it in 5.0.0, but basically it would be such that you wouldn't need to define your types upfront in a QueryHelper. You would directly be able to use the QueryFactory on the cache to create queries, as long as you have the <indexing enabled="true" ... /> config parameter set.
Ok -- that's excellent. It looks like changes on my end would be quite minimal then -- which is what I was hoping for.