From a marketing perspective, holding back any major announcements about either Kingdom Hearts 3 or Final Fantasy XV is a smart move.

For months Yoshida has made us aware of major announcements for FFXIV coming at E3 this year. At the very least, we're going to get reveals on the new classes and jobs coming to the game. It's also very likely that we get a drop date for the first full expansion for the title, which they've said would come out approximately a year after release (so likely some time between September and December 2014). It's also possible we'll get more details on long-discussed but currently unreleased features such as chocobo breeding and racing or the Golden Saucer.

E3 is an ideal platform for Square Enix to drop major news for Final Fantasy XIV. As an MMORPG, FFXIV has a more limited audience. It certainly doesn't demand the media attention that KH3 or FFXV will. They have regular updates and Live Letters that, by and large, go unnoticed by those not already playing the game.

Think about this from Square Enix's perspective: after FFXIV's re-release in August, the company had to revise it's financial forecasts significantly twice to reflect how much that one title has impacted their bottom line. Final Fantasy XIV already has more concurrent subscribers than Final Fantasy XI ever reached at its peak, and FFXI was the single-most lucrative game in the history of the company. It's no wonder that they want to shift attention to FFXIV, and it would become far easier to ignore in the wake of any noise KH3 or FFXV would cause.

E3 provides a platform where everyone is watching. They're going to use that to try and drum up excitement for people who aren't up-to-date on the title and try to swing that into additional subscriptions. People who otherwise wouldn't be looking at the title are going to see it just because they're paying attention to E3, and if they make some big announcements that appeal to long-time Final Fantasy fans (and those fans don't have a shiny new FFXV to be distracted by), they're far more likely to succeed.

Final Fantasy XV and KH3 do not require such a platform. They're a platform unto themselves. Some grunt at Square Enix could make an offhanded comment about either title at a company barbecue and the media would collectively trout themselves and everyone and their mother would hear about it. That's why the comments about why we won't get either title at E3 this year was phrased in the manner that they will show it at the "optimal time". Square Enix can make their own media event for those titles later this summer and it will be just as effective if not more so as doing it now.

On a side note, in regards to Kingdom Hearts 3, I think Square Enix recognizes the issue that they've put themselves in by spreading out important entires into the series over so many different platforms. Obviously the re-releases of Kingdom Hearts 1.5 and Kingdom Hearts 2.5 are the solution to resolve this and get the majority of fans of the series on the same page. By consolidating as many of the titles as they can on a single platform, it lets them gear everybody up for Kingdom Hearts 3. It makes sense that they're going to push Kingdom Hearts 2.5 harder ahead of a real marketing campaign for KH3. It makes their job easier down the line.