One beneficial side effect of Sandy Petersen and Greg Stafford stepping in to take direct control of Chaosium and put a new regime in place (spearheaded by the Moon Design Publications crew) is that it allowed the new regime to work closely with the creators of Chaosium’s most beloved setting (Stafford and Glorantha) and RPG (Petersen with Call of Cthulhu). On the Stafford side of things, it enabled them to produce a shiny new edition of RuneQuest that’s truer to Stafford’s vision than any preceding edition (having incorporated concepts developed in his home campaign and Pendragon in quite an artful manner), and it’s nice that they were able to do this before Stafford’s unexpected passing.
On the Petersen side, his takeover took place a bit late in the day for him to have much direct role in the new edition of Call of Cthulhu – Mike Mason and Paul Ficker had largely done the job already and the old regime at Chaosium had got up to the point of working on the layout and preparing for printing before they fell over and died. Moreover, the new edition is pretty dang good and doesn’t really need that much of a tweak in the first place, and Petersen has Petersen Games and Cthulhu Wars to manage as well, so one can’t necessarily expect to him to just dive in and start writing masses of material for the game again.
No, I’d say the first really big fruit of Petersen’s new closer involvement with nu-Chaosium is Petersen’s Abominations, which is a set of five modern-day scenarios based on scenarios devised by Petersen for convention play.