Apparently, the upcoming Planescape boxed set will include an adventure that includes a low-mid level section and then a section at 17th level. Characters will enjoy a level jump just before that final section of the adventure.
I should note that I have absolutely no objection to the use of a level jump within an adventure, and it's good to see WotC finally publishing some high-level material. I just with they were better at it - ever since 3e they've had difficulties in both providing such support and in making that support worth having.
Speaking for myself, I've never used a level jump. I'm not particularly a fan - I'd generally prefer to start at a higher level than build in a jump, and given that the game just runs better at lower levels anyway I'm inclined not to bother.
That said, there is one time I should have used a level jump. This was a "Roman-esque" campaign from back in the day, from sufficiently long ago that I didn't name all my campaigns. The campaign had been running for some time, with the characters reaching level 8 or so, before life events led to me bringing it to a premature end. Unfortunately, the planned end basically involved a Godzilla attack (actually a Hellfire Wyrm, from back when that was a singular monster of extremely high CR, rather than just another type of monster).
The planned end of the campaign expected the PCs to have reached 20th level and acquired a number of powerful magical items. The actual end featured wildly under-powered PCs with a few good items, and thus ended in a TPK. (There was actually something thematically interesting there - sometimes the apocalypse doesn't wait for the heroes to be ready to face it. But as a game experience it wasn't great.)
In hindsight, I should have built in a level jump, set the PCs up so that they weren't quite ready to face the beast, and gone from there. But, alas, I just didn't think of it at the time.