Pre-Trial is your first chance to make the real serious motions.
By that point, Lens attorneys will have had time to review all the evidence that's going to be brought by the prosecutors, so this is their chance to make motions to have some of it excluded due to relevance/procedural error, same with potential witnesses, if this were a high-stakes trial for a very public murder, or fraud case, this is where your attorney would motion to change venue because you can't get a impartial jury locally since everyone's heard about it and thinks you're guilty..... that kind of stuff.
They may make a motion to dismiss everything on the grounds that there isn't enough evidence to even waste time putting it in front of a jury, but I doubt it, it seems from a feeling-out over the months that there's enough "meat" here that Len is headed for a full blown trial, this is just another perfunctory step to whittle down exactly what the issues are and try and weed out superfluous witnesses/exhibits on both sides, like, if 4 people saw Len allegedly trespassing, and are willing to testify, they (the prosecution) is going to try and pick the two best ones (who saw it clearest) to take the stand instead of letting EVERYONE get up there because that just makes it longer and more costly... those kind of decisions.
Assuming there is no plea at that point, and no dismissal, the next step is an actual trial date and the seating of a jury.
This whole thing probably has another six months to run before what we think of as a "trial" starts.