That is currently undecided, though I am still leaning heavily toward Out of the Abyss. I've been slowly but steadily acquiring all the support pieces I think I would need to do a top-notch job running it (MS Office (maps!) for the laptop I replaced in March, Jared Blando's digital maps keyed to the adventure, the PHB, DMG, and MM).
But I also recognize the timeline for my master plan may shift things. I think it'll take us a decent bit of time to complete Stonefast. And it'll be another decent bit of time to wrap up Grim Frequencies. I'm pretty juiced to do an Underdark campaign, have been for a couple of years, but will allow for a change of heart in the intervening months depending on what's current in the gaming world. I've also, for example, been keen to do something pulpy (NOT campy), with dark horror. Pretty amusing--probably only to me--since I'm a person who doesn't appreciate horror movies. At all. The written word, though, that's different.
Changing gears, what are some things that interest you guys?