We were just at HHV last month, and although I didn't count them, there are still quite a few empty shops, particularly in the International Bazaar section. At one point, I thought I remembered reading they were going to tear that down and put in a new tower there, but this new tower does not seem to include that area, so I think the plans changed. In any event, they could definitely improve the shopping and dining options.
A pedestrian walkway would be nice, but it would be expensive and may only add to the resistance from some locals who oppose the tower. My employer added an overhead walkway connecting our newest building when we had to add across the street. Even in downtown San Jose, where there are not really views to block, there was some opposition to our overhead walkway.