Can't answer your first question about the construction, but can confirm that the Residences were re-named Hilton Dubai the Walk and it is located opposite the Hilton Jumeirah Beach and joined by an overhead walkway.
Thanks. I'll be in Dubai for 3 nights next month as part of that EY mistake fare. Since there are 3 of us I was hoping to get a suite with multiple beds without going broke and so far this Hilton Dubai the Walk seems like my best bet so I'll probably end up booking it.