The How I Met Your Mother spinoff How I Met Your Dad is definitely moving forward, and now there's a casting breakdown for the new crop of characters. The show will center on Sally. From TVLine:
SALLY | She’s vibrant, messy and unpredictable — a “female Peter Pan who has never grown up and has no idea of where she’s going in life.” She’s thinking of calling it quits with her husband of a year, Gavin. She’ll lean on her circle of friends for advice and support through the inevitable divorce.
The rest of the characters include her brother, her brother's husband, her best friend who runs a fashion blog, and that blog's IT guy who has a crush on Sally. It's tough to remember now, but HIMYM was so good in its early days. Maybe a HIMYD could recapture some of that. That would be nice, right?