Finally we are going to get THE Jagged Alliance game ^^
Really hope it works with 1.13 mod.

Where does it say it's the Gold version? As far as I can tell it's just the 'regular' JA2. The gold version is basically JA2 running on the Unfinished Business engine (so with several improvements).
Wikipedia on JA gold:
"This release added the improvements from Unfinished Business to the final release of Jagged Alliance 2. Unfinished Business is included in the package. Like the rest of the series, this version of Jagged Alliance is out of print, but as of July 2006 it is available via the Steam content delivery system, as well as Turner Broadcasting's Gametap. Although playable this version does have a bug which causes the player to have infinite money rendering financial strategy irrelevant. The expansion Unfinished Business contains a bug which results in the player unable to save his progress. Strategy First has acknowledged the issues but has failed to provide a fix.[3][4][5]
One difference with the Gold Pack version from the original is the change to the advanced difficulty. In the original version, the advanced difficulty choice makes all turns timed. This is especially noticeable when getting an "interrupt"; at lower levels, the player might only have 3-4 seconds to try and get their shots off, and no time to switch weapons or try a different tactic. But the Gold Pack incorporates the change to gameplay introduced with Unfinished Business, i.e., the JA2's advanced difficulty modification is that the player can no longer save in combat, and their turn doesn't end until they use all of their action points."

I really thought it was JA2 Gold, but maybe it's only JA2 1.12 Version...
Could we please have a confirmation from an admin ?

Oh, that would be a bit of a disappointment, actually...there's a lot of fan mod content out there, but almost all of it is for JA2 Gold 1.13.

Hrm, so the gold version is better?
What about this:
http://ja2v113.pbwiki.com/
?

Huh, actually I was mistaken...the regular JA2 game will do fine (once patched to 1.13).
By the way, for anyone interested, The Bear's Pit is sort of the hub for JA modding in general.

It's ood, though, as Steam (and Strategy First, apparently) both sell the gold edition for $20. I wonder how GOG was able to get it for $10?

because this is not the gold edition

and the gold edition comes with Unfinished Business as well. Still, Jagged Alliance 2 and UB will cost the GOGger a mere $16