I'd tend to think they'd release everything to coincide with the premiere of Season 40, which falls on November, they real 40th birthday (despite being in development for at least a year prior, which technically would make it 41). And these things have a history of celebrating every 5 years of being in existence.
If there is anything stumbling around a special, it could very well be budgetary constrictions. SS has a razor thin budget this year (like so many others... not getting into why). I don't think that really could stop them, so much as hamper them.
Again, I wanna see merchandise as well, but that's probably coming out in November.