They just started on Infinity Defense so obviously projects are moving, my guess is that the EGW stuff will start over the course of the next year or so. There is no specific opening year for Avatar, that is just a guess on the part of others here (you being one of them I believe) that it'll open alongside the 4th movie in 2029. Heck with the 5th movie now coming out in 2031, they could even wait until then to open the land. But there is nothing that says it has to open the same time as one of the upcoming movies are released. In fact it would kind of make sense to open it on an off year to keep Avatar in the news cycle, 2028 or even 2030 is possible.
Anyways back on EGW, we already know that its been approved by the City, so I don't see any specific snags they could have hit with the project, the permits are just a formality at this point.