YoshiP did state several times that the item limit increase is coming in 7.x. What was left unstated was whether it would be both outdoor and indoor, and how large an increase we'll be getting.

There was also mention of other changes, such as being able to change the interior architecture (pillars, stairs and that sort of thing) to the type we want regardless of district and possibly even pillar free (that was still a work in progress the last time he brought it up) but no mention of when those changes might happen.

So the item limit increase has been "promised" but as usual players may be setting their expectations too high about what we'll actually get and when.