Integration with Lucene isn't planned. The main problem is that we don't have any experience with Lucene, so for example how is lucene integrated with sqlserver or other databases in such a way that when you update a row, lucene is updating its store as well? To me, that's external, so when you update a row, you also have to update lucene.
To filter a database on results coming from an external source, you either have to be able to use that source in a SQL query (IMHO only possible with external stored procs in the case of lucene) or you've to pre-filter first using lucene, i.e.: first ask lucene which IDs match a filter for example, then use those IDs to obtain a range of entities. that last part is doable with llblgen pro (it supports range filtering based on a set of values), though you have to do the lucene updates yourselves as well as the filtering on lucene. So for example when an entity is saved (you can intercept that in llblgen pro) you can for example call a Lucene api method to store that info: ID + searchable field values, which you then can filter on later on. That's the only way I see how this will work.