User blog comment:ImagineTouma20/Dengeki Bunko 2015 Fall Festival Banner/@comment-26044807-20150610170144

So I realized that the characters on the banner aren't as important as I thought originally, after looking through past Fall Festivals.

It's the stage events that are the most important because that's where they MAKE the announcements.

If you visit the website you will see there are 3 events already planned: DRRR, STB, and HO. What do these all have in common? They have anime to promote. DRRR will be done with its 2nd cour when the fes starts, HO will be starting in a week, and STB has a 2-part OVA coming out near the end of 2015.

Now this leaves 1-2 more anime stage events and grand finale where they usually make another anime announcement.

When these extra anime stage events are revealed we'll have a better idea of what anime to expect they will announce.

The characters are usually there for promotion.

Izaya and Milinda are there to promote DRRR and HO.

Kirito is the face of DB and is insanely popular and he's there to promote the festival and sell merch.

Kino is having its 15th anniversary so she's there to promote that event and sell Kino merch.

Emi from Hataraku Maou could be there to sell merch or because of a possible s2, but you can't be sure. I mean Kuroyukihime was on the banner last year and there was no Accel World S2 announced.

Ako from Netgame no Yome could also be there to promote a new anime since there's never been an anime of that LN series before or she could be promoting something else.

Bottom Line: Wait for all the stage events to be announced before speculating.