Present continuous is best given a CEFR level by lexical VERBing in the English Vocabulary Profile. The English Grammar Profile has many levels that are mostly based on range. There is also a point at C1 for rhetorical questions with present continuous.
B2 point 45 in the category of FUTURE with present continuous is defined as
the present continuous with a wide range of common verbs to ask about future plans.
B1 point 28 is the same except:
an increasing range (future plans)
A2 point 5:
a limited range (future plans)
Some of the listed verbs in the examples for B2 are: planning|starting|finishing|providing
But we can also assume to some degree that B1 and above verbs that are in verb-ing structure qualify.
This is a very hard structure to search up for a number of reasons. In particular, the discourse/use must refer to future plans, so we will only be able to look for formal features temporarily. As a result, we must try a few ways in.
On iWeb a search for
. _vb _p _vvg ?
1 . ARE YOU KIDDING ? 246
2 . ARE YOU LISTENING ? 101
3 . IS IT WORKING ? 72
gives us only a few results. None of those seem to suggest plans.
As we attempt to search further iWeb only allows one wild card. In the top 50 we get some possible planning verbs, at B1:
applying, going for, thinking of.
_vb _p _vvg * ?
Obviously many of these Ngrams could be questions about plans, but here we remove those that look quite obviously not about plans.
33 ARE YOU GOING TO ? 152
34 WERE YOU LOOKING FOR ? 148
35 ARE YOU APPLYING FOR ? 136
39 ARE YOU GOING FOR ? 127
55 ARE YOU GOING WITH ? 82
66 ARE YOU VOTING FOR ? 68