Until Ono or someone at Capcom goes on record and explicitly says "we're adding an arcade mode", it's all fluff. PR non-speak to try and placate people.
The fact Ono won't give confirmation of the on single player mode(s) "they're looking into" makes me think he's offline content will just be shitty tweaks of the existing story mode or survival, rather than an actual Arcade mode, or World Tour mode, or something at that level. Half-arsed content, made on a shoestring budget.
Loved to be proved wrong. SFV needs decent offline content to much, especially if they want it to sell enough to warrant long term support and updates.