Hate to say it, but if they are only just releasing the product at date X, then will move directly to DLC (next income stream) and bug-fixing, then at that point dev tools may be another 3-6 months away before they get serious time.
And beyond very brief and basic info we don't even know if we will have really nice mod support or not, rFactor promised a lot but failed to deliver here. If AC team see's more value in producing high quality DLC and making money vs making high quality dev tools which will reduce the market for DLC and lose money, then I can see them going with the former...
As much as I feel your pain Shadow Explorer, I really wouldn't pin anything on AC right now from a modding POV. You might be waiting another year yet for even the first release, and decent mod stuff may never come or even be written out if a lucrative license deal crops up and changes their angle on modding!
I'd work on some great mods for games that are out now and you can make good mods for... pinning passions on AC is in my view a waste of your precious limited time to make great mods for us
I just don't get why devs can't be more honest really. If it's now September, say September. If it suddenly becomes July, then change it back to July... what is the harm in that?
Like I said, start worrying when they offer pre-order DLC. That is when you know you are in for a long wait and very likely to have promised features starting to be cut
Dave