Cong! Ihis is offer, if they want to reject you, they will call you on the spot. There is really no hassle to reserve a time for rejecting anybody. The only reason to schedule a call is to negociate the offer terms. So ready to negociate. baozi plz.
pat. For most companies a call would mean offer, but for G it really could mean either way because they send rejections by phone too. Personally I think that's really weird, but they probably think that pays respect to the candidate.