It's only been two months since the Ubuntu(upstream) release. The versioning reflects that base. They've been working on Cosmic, which is no small thing, and likely the reason for the delay.
Either way, it's 2 months late and 4 months until October's release, so not really ridiculous or anything.
Either way, it's 2 months late and 4 months until October's release, so not really ridiculous or anything.