Pre Load Date

I just preloaded on both my pc and xbox one console so you should be good to go.

Pre-load is usually a week or so before launch but I haven't seen an official date yet.

Regardless, Gamestop is releasing the game on the 6th so you can pre-load everything for the 7th release date.

Pre-loading simply means downloading the game before launch but the game doesn't activate until the launch date.

The answer here is quite simple. The PSN is a pre-order, not a pre-load. On PSN you can only pre-load days before the game is released. On XB1 you can only pre-load/pre-order when there is a game to actually download. Meaning the game has gone "Gold." The
reason we can't pre-download right now is that the game is still not finished. Not ready to be put on discs and not ready to be put up on servers for pre-download. As soon as it is, the pre-load will be available.

Personally I prefer this to PSN's pre-order because at least you know the game is ready when you do it on XB1 but you could shell out that cash for the PSN version and the game and the game might miss it's release date and you have cash in limbo for no reason.
Pre-orders are stupid. XB1's pre-order/pre-loads are a breath of fresh air in an otherwise greedy game economy.

"Pre-order this game now from Gamestop, even though the game has no release date and won't be seen on shelves for over a year." . . . ridiculous.

That was in reference to the new Batman game btw, not GTA V