You can download this app below named ".conf Archive Search". Hope this helps.
https://splunkbase.splunk.com/app/3330/
Both recordings and session materials have been posted and are available here.
Note: Some speakers did not give permission to publish, those will not be available.
Found some at http://conf.splunk.com/speakers.html#; each slide deck is listed in the breakout session.
As of this entry, can't seem to find the sessions content. A colleague who attended the conference also claims to have seen session entries, but he too now reports that they have gone missing. Let me know if something turns up, session slides, sasquatch, jackalope, yehudi ...
It usually takes a few weeks for the slides and session recordings to be available online. I believe that you will receive an email notification, but I would check around a couple weeks into October just in case.
The slides available through the mobile app might not be the final ones used in the presentation.
These will be available at conf.splunk.com in the near future.