kroetenschemel: what's the point of the cross-multiplayer anyway when there's almost no games to use it with?
Potzato: For newer games, the interest is obvious : being able to play with people on steam.
For older games, if they don't work on steam, no need of cross platforming to begin with ; if they work on steam .... same reason as before?
Not sure I am following your second point?
But your question is clearly interesting : should we expect some kind of virtual networking (like hamachi), some lobby thing like gameranger ... or what ?
My second point is, that if Galaxy is effectively just a better downloader for old games, but not a multiplayer support for them, it requires GOG to sell more new games that means going in direct concurence to steam and origin. So we're to expect more new games to GOG next year. Also combinded with their local prizing "refund" policy and their quality controls, it's gonna be a hard time for steam, at least in Europe. Imagine when you can buy a game on steam or you buy it on GOG, get better service and also another game of your choice. It's a clear win for GOG then, but only if they're going for the new releases.
That means we're either getting better support for older games or a paradigm shift with gog reguarding what they sell.
Also I predict the "optional" thing will get a revision. I predict that if Galaxy prooves itself to be a working multiplayer platform, Indie devs that are developing multiplayer titles, will want to get onto Galaxy as well. So if there's a multiplayer only title, to that title, Galaxy obviously has to be mandatory. Then it'll be interesting how they handle DRM and account binding.