Okay, these are not confirmed yet, but there's a huge possibility these are the actual future episode titles and summary. Have a go with'em, I guess we can guess after the merman episode airs.
! >1.14 Bottomless Pit!
While Stan, Dipper, Mabel and Soos are falling in a bottomless pit, they tell stories to pass the time:
Listen! To Dipper’s puberty voice, before and after the Change!
Watch! Soos, Mabel and Dipper face off against a magic pinball machine!
Learn! What’s in Mabel’s Mysterious Box of Secrets!
! >1.15 The Deep End
When Wendy temporarily quits her job at the Mystery Shack after an argument with Stan, Dipper drags Mabel out to see her at her new job… as a lifeguard at the public pool. There, Mabel meets a cute merman, who needs her help. Meanwhile, Stan learns just how indispensible Wendy really is, especially when Manly Dan pays a visit.
! >1.16 Carpet Diem
Twins sharing a room can be contentious at times… so, when the two discover a secret room in the Mystery Shack, it seems like an easy solution! But there’s one problem… they both want the new room. It’s larger than it has any right being, it’s got lush carpetting, and it even has its own bathroom! But the room holds a dangerous secret, and it’s all tied in with one of their old enemies…
! >1.17 Love Bites
Dipper stalks a dangerous creature from the book… who seem to be stalking Wendy and Robbie while they’re out on a date! Also, while at a sleepover, Mabel gives one of her friends a makeover so she can ask out a boy, and Stan goes out with Lazy Susan.
(Editor’s Note: I believe this was meant to air for Valentine’s week, but for scheduling problems)
1.18 Mabel Bodied Dipper
When a mysterious animal in the woods makes Mabel and Dipper swap bodies, Dipper wants to do everything he can to track down the animal and get it to reverse the process… but it doesn’t take Mabel long to realize she has more fun being Dipper… and, to her brother’s dismay, that everybody likes Dipper more when Mabel’s in charge. Meanwhile, Soos has an epic battle of wills with Glomper the goat!
! >1.19 Every Which Way But Soos
Soos’ ex-girlfriend comes back to town, and the twins see a side of him they never expected… lovesick puppy. It only gets worse when, when he sees her new boyfriend mistreating her, and Soos challenges him to a duel. But he’s a real monster, and if Soos can’t beat him, Mabel’s pig Waddles is the prize.
! >1.20 Honey Dipper
Dipper makes a startling discovery while using an outhouse in the woods… everything that drops in it turns to gold. Using this newfound source of wealth, Dipper instantly becomes the richest man in town, earning him his Grunkel Stan’s respect, the unwelcome attention of Pacifica, and an invitation to one of Gravity Falls’ most secret of secret societies (which has a serious cash flow problem). But when the magic fades away and the gold starts turning back, he’ll be in deep… trouble!
If these are real… doesn't look like much fun. Damn.