Updated: Capcom addresses Ibuki's delay in Street Fighter 5 via Twitter, promises to better communicate info surrounding content release in future
Capcom has put out a few tweets on the matter, and promises to better communicate release content in the future:
Click images for larger versions
According to the blog, Ibuki's release is actually set to come alongside the story expansion DLC. Capcom has released their latest content close to the end of each month thus far, so it's likely that we won't be seeing Ibuki in the hands of the public until then.
However, this is merely speculation and we very well may see the next batch of Street Fighter 5 content arrive earlier than that.
Sources: Saikyo Blog and Street Fighter's Twitter. Contributions to this story made by MajinTenshinhan. Sent in by cuzzo, SethGravijah, Golgaut, Shinkuu_Kikoken, Sean_Saibot, originalhuman, and nightmaresteam.