Got same problem here.
I have two customers with online, and they're unable to use Apps for w8/Ipads.
We tryed with our crm2013+adfs deployment and tablets/mobile are not working. The apps simply asking credentials (android, sometimes W8) or not allowing you to enter with various errors (Ipad/iphone, W8.1).
CRM2013+ADFS3.0 are working fine if yout them with a browser, from PCs and from tablets/mobiles too (for mobiles, its switch in /m mode).
On ADFS/CRM we enabled form based auth following the crm2011+adfs implementation manual.
On ADFS we have errors. Seems that we are coming with wrong name/password even if we are using the same credential on the same org successfully if we browse it with classic browser.
So ADFS is working fine, not for mobile.
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Terrance | Apps4Rent