Conclusions:
1. Based on the road layout, it's a revamped St Mary's not a totally new stadium
2. The new buildings would require the purchase of the Industrial Estate behind the Chapel Stand and Cemex moving out from the Riverside.
3. There is a question mark after 'Our Future...' these are just a taster, not a finished plan.
4. The quality of the drawings say to me that these have been done by a professional graphical designer. That the club has released them into the public domain indicates to me that at least investigation has been held into upgrading St Mary's (but then we know that's happened in the past anyway...)