According to report from The Verifier(blog of Israel), Apple is planning to update iOS 11 with Group Video Calling Support
on FaceTime later this year which allows you to add upto five people to your
call. Along with that Apple will update iMessages on iOS to let users start a
group FaceTime video call with up to five people at a time.
Apple is planning to update iOS 11 with Group Video Calling Support on FaceTime later this year which allows you to add upto five people to your call.

iOS 11, will include several new features, one of which is the multi-user to
make a call FaceTime video service. According to information reaching the site,
the next update for the iOS operating system 11, will be more Update ‘social’
that will put an emphasis primarily on chats on iMessage and FaceTime.
It will be possible to start a video
call with FaceTime through a group conversation in iMessage, when the
FaceTime icon will appear in the options group, and will support video call
with the option to add up to five people at once. Is not clear at
this stage what will be decided and whether Apple finally released the iOS
feature film above 11, or in a future update.

Apple will likely be introduced iOS 11
and major software updates at WWDC in early June.