I know there is no 123i announced at the moment, but if you look back in time, there was no 320i initially during lauch of the E46. And there was no 323i either during the launch of the E90. This is only the proper business tactic, where you lure the early adopters who are willing to pay more money with the more expensive models first, and then you offer something cheaper to get the remaining people who are less willing to pay, but still wants your goods.
I would imagine that the 1-series coupe would require a different set of certification and red tape than the coupe, so BMW may not bring that model in. I am quite optimistic about a 123i though.
-Rick