Information is from Letter for the Producer X released May 20.

Quote Originally Posted by Yoshi-P
This time around, the list contains additions planned for up until summer 2011. You see what I did there with the bold font for emphasis? But anywho, without further ado, feast your eyes on the list in its entirety! (Remember, these are our plans until summer 2011!)
Highlights from the list:

  • Grand Companies quests (initial quests were in 1.18)
  • Job quests
  • Job system (Specifics, mechanics, assets)
  • Materia crafting system
  • Reward and balance adjustments for Behest (1.18)
  • Equipment attribute revisions
  • Synthesis recipe revisions
  • Repair system improvements (1.18)
  • Auto-attack system (1.18)
  • Crowd control system revisions
  • Rexamination of surplus values (Abolished with fatigue in 1.18)
  • Changes to DoM and DoW (1.18 but ongoing, I'm sure)
  • Abolition of Physical levels
  • Physical bonus revisions (automated stat allocation)
  • Changes to how actions are set
  • Frontier hubs (1.18)
  • Strengthening of beast tribes (I never had to fight them pre-1.18 so I can't say if they're stronger post 1.18)
  • Environmental collision detection (1.18)
  • Enemy distribution adjustment (1.18)
  • Ifrit battle
  • Achievements
  • "Mount" system

So of about 22 major revisions/additions, just under half were introduced in 1.18.

Quote Originally Posted by Youshi-P
A number of plans made at the beginning of the year will soon be ripe for release. Among these are the shiny new job system (a proper system, mind you, not just renamed classes), an in-game achievement system related to Lodestone character histories, and new modes of transport to address the mobility issue. Once our current plans progress to the next stage, I believe it’ll be possible to unveil a longer-term update schedule. (We’ve been giving chocobos a lot of thought, but it’s hard to establish a timeframe before we define exactly what needs to be done.)
He didn't mention airships in the list, but does later in his dialogue about the list. In May they were "uncertain" of chocobos, but by July 18, they were certain of their introduction by 1.19.

Quote Originally Posted by Yoshi-P as translated by Bayohne
Here is a simplified plan:
1. Calling a personal chocobo
2. Riding a personal chocobo
3. Walking next to a personal chocobo
4. Raising and dressing up a personal chocobo
5. Fighting with the help of a personal chocobo

I created this plan myself, but some features are not possible to implement at this moment. It would take way too long to implement everything at once, so we plan on implementing this bit by bit, starting with numbers 1 and 2. This is the plan for patch 1.19. More details will be revealed later in an upcoming letter.
Quote Originally Posted by Rukkirii
I’ve come to help settle some of your speculations! The chocobos that will be implemented in 1.19 will indeed be rental chocobos that you can control yourself, but this is just the first step with our feathery friends. Bayohne did drop some hints here about things we might be seeing in the future, though....

Wark~
My point in digging out these quotes is to show that despite 1.18's delay, things intended for 1.19 were still progressing independently. Chocobos went from an uncertainty to a definite in two months time while 1.18 was being finalized.

So we can expect airships, chocobos and jobs by the end of summer, as they've been worked on all along. We'll have to wait for Yoshida's 1.19-focused Letter from the Producer to find out where everything really stands.

Ultimately, I won't be too depressed if the timeline is pushed back. I've waited this long. All it means is that once my Marauder is 50, I can play Dead Island/Arkham City/MW3/BF3/Skyrim till a free game is brought up to snuff.