We have been looking at new stadium designs for a number of years , unfortunately we could never afford the cost.
I think that we probably have a very good idea of what we need in the stadium , facilities , capacity etc. These issues are crucial and I would think the length of any new project will be shorter because of all the information that is already researched.
We need a venue, a design , costings and of course planning. I would again expect that planning and costing are largely concurrent and we have seen posts already where costings have been sought for some building materials.
If/when a deal for a site is confirmed I think we will see real progress.
Spurs were similar, they had been ready for long to build a new stadium , when they finally got the opportunity it was able to race ahead.