I suspect they'll do whatever is most appropriate from a practical and engineering perspective, not on aesthetics (why, won't be playing until both corners and ESU are done anyway).
phase 1... ESU and south corners.
phase 2...(next year) north corners.
And didn't Gus want the away fans moved to the East too?
They will be in South East corner.
Does this work include the new corporate boxes above the South Stand seats?
This summer is East Stand Upper plus the south east and south west lower corners
December is the "wrap round" in the upper south corners
Next summer will be the north stand corners at ground level plus an upper level wrap round in the north west corner.
From memory there is upper level work to do at the of the south stand end to include sponsors' hospitality, players' lounge etc and I'm guessing that is part of next summer's planned work but I'm not sure.
This was posted before but excellent to give you an idea of what is being done:
AMEX expansion plans revealed
They will be in South East corner.
the north stand is going to look very odd by itself once phase one is complete