Most of my experience is with Dark Heresy 1st ed, with a bit of Deathwatch and Black Crusade here and there, most of it in the same sector with the same history and group of players. Sadly, we've all but disbanded due to various familial or financial obligations to the point that we can't muster a proper group anymore, so that's around 7 years of Dark Heresy history that is largely gone now. The only thing I have partly developed is an Only War game with a twist - the PCs are all Adepta Sororitas. Would be set during the retaking of a shrine world from the Tau Empire, with a good helping of various Tau auxiliaries for variety (tau, kroot, vespid, gue'vesa, etc). That has a very narrow scope by comparison to a Rogue Trader game, given that all PCs have the same origin, faith, even gender, and the combat would likely feature heavily given that it's Only War. I personally just want to see a successful RT game at all - I've been in about 5 RT campaigns that have all had a failure to launch in some form, but I want to really see the setting shine. I just don't understand sandboxy games well enough to try to make it happen myself.