The documentation update for jQuery 1.8 is not online yet.
According to this recent blog post:
We’re in the process of updating the API documentation for all the
changes to 1.8, but for now you can refer back to the changelog in the
jQuery 1.8 announcement to see what’s changed.
Update: Yes, then()
returns a new Deferred
because it is equivalent to pipe()
now. I’m pretty confident the documentation update will clarify this soon.
Further update for completeness: The documentation was recently updated and now says for pipe():
Deprecation Notice: As of jQuery 1.8, the
deferred.pipe()
method is deprecated. Thedeferred.then()
method, which replaces it, should
be used instead.
And for then():
Prior to jQuery 1.8, the arguments could be a function or an array of functions.
[…]
As of jQuery 1.8, the
deferred.then()
method returns a new promise that can filter the status and values of a deferred through a
function, replacing the now-deprecateddeferred.pipe()
method. The
doneFilter
andfailFilter
functions filter the original deferred’s
resolved / rejected status and values. TheprogressFilter
function
filters any calls to the original deferred’snotify
ornotifyWith
methods. These filter functions can return a new value to be passed
along to the promise’s.done()
or.fail()
callbacks, or they can
return another observable object (Deferred, Promise, etc) which will
pass its resolved / rejected status and values to the promise’s
callbacks. If the filter function used isnull
, or not specified,
the promise will be resolved or rejected with the same values as the
original.