If I can throw my theory into the bucket:
Seems to me, most of these things were cut out due to memory issues. Some of those limitations are already f*cking with the game (Liquor stores and gas stations that are forever closed, and obviously the properties issues). Instead of trying to squeeze in these bits onto one disc, the initial game, it make sense to cut them now and include those features in a separate download disguised as GTA Online (+plus offline content cut before release due to x reasons).
IF, and only IF, that's the case, then their silence up to this point makes sense, and i'm sure everyone would be willing to wait another week for the awesome that is property ownership on the beach!
However, i'm just trying to look on the bright side. They've netted a $1 BILLION dollar heist of their own with careful planning, I just hope we get the full piece of the pie we paid for, lol.
P.S I visited the Dynasty 8 website on day 1. I could only do the GPS coordinates option, not purchase.