To fix the broken ball stud problem, try skipgear.com. Skip makes a modified shock tower which bolts on in place of the standard one. The skipgear tower has two pieces of aluminum angle where the ball studs go so that the studs are now vertical. When one breaks, just replace it. The second time you replace just the stud instead of the whole tower, you've made your $$ back. Added bonus is that you can tune your roll centers by adding & subtracting washers at the tower. Thus, you can run the plastic hub carriers, reducing unsprung weight from the aluminum carriers.
I understand Losi intends to bring out a truck with the new tranny and suspension revisions sometime next spring. The new rear suspension does away with the pivot block, mounting the arms instead in similar fashion to the XXX-4. This allows easier adjustment of anti-squat and eliminates the E-clips.
So far, they're saying you must buy either an whole new buggy or a ton of individual parts -- there is no plan to market a "conversion kit." One assumes the truck will be the same. Major Bummer.
Engineering Without Fear