So where does Sony go from here. First they need to determine if the RX1 will be successful--lots of press and heated talk on the internet does not translate into sales. If they have stock of their first production run in six months, then the adventure is costing them money. And once bitten, twice shy.
If it is a success, I imagine they may try a zoom version. No ICL. This is Cyber Shot branding which are Sony's compact cameras. They know that the bottom has fallen out of the low-end cameras because of cell phones and all they have left is to go up. Hence the RX1 and RX100. But Cyber Shots are not ICL products. There is a good change a 35mm zoom RX2 could still not have the EVF built-in--Cyber Shots are compact cameras, with the emphasis on compact.
So there is the Nex series. This is highly doubtful as that is an APS-C camera line. It is too costly to add a new format to that series.
That leaves their Alpha series. They may make a a99 Jr. mirrorless body, but it is still a long shot. Do you keep the same mount with that flange distance or do you make an adapter? Then do you really want to run two lens lines?
Now, if this adventure turns out to be wildly successful, they may be some movement from Sony or other manufacturers to try an ICL 35mm mirror less. But they will be careful as the first of a concept can be the best selling one as well, where follow up models do not do as well.
The best way to see how this pans out is to wait 10 years. Predicting is hard to do, especially about the future...