Found some interesting tidbits from an Hungarian interview with Adam Driver's stunt-double; Toth Gyuala. The weirdest reference was in a The Mirror summary article which makes a reference to Toth having filmed "many of Driver's lightsaber battles." As far as the rumours that we have read so far, isn't Luke the only one people have suspected will appear in a duel With Ren? If there will be "many" lightsaber battles who would Kylo Ren be battling? There was that video some time ago that were supposedly a rehearsal for a scene where Kylo Ren fought several Jedi students. It was denied that it was SW related, but maybe we will at least see something similar regardless. Of course all this could just be a mistake by The Mirror writer.

More cryptically when asked if TFA would have PT-style duels or OT-style duels he simply said: "I can tell that it is not by chance that the title is The Force Awakens, the lightsabers will have a major role."

At least when asked about the use of practical effects and real sets he was much more specific:
"I think 70 percent of the scenery was actually built and could be touched." "Abrams really feels what the fans didn't like in the Prequels. He strove to capture the IV.V.VI. atmosphere. During filming, he worked through the tools of the old trilogy, and only marginally used the technology at present. In Abrams's film we can see sparkling effects if anyone shoots ray gun fire at something like a long time ago. And it is really good that he really made these sparks on the set."

Full interview:
http://www.starwars7news.com/2015/06/interview-with-adam-drivers-stunt-double.html

The Mirror article:
http://www.mirror.co.uk/tv/tv-news/star-wars-force-awakens-stunt-5860720