It is a verb tense that indicates that something will occur in the future and continue for an expected length of time or it is used when an action is expected to occur in the future and be completed..
Subject + will + be +(the root verb + -ing).
SUBJECT + HAVE / HAS + VERB (PP) + COMPLEMENT
Subject +has/have been + the present participle (root + -ing).
The present perfect continuous tense (also known as the present perfect progressive tense) shows that something started in the past and is continuing at the present time.