Deep Silver community manager here. Some more info below:
By now, the US version of Sacred 2: Fallen Angel should have been replaced with/updated to the DRM-less version like the European versions were. For US users this means that if you own Sacred 2 on Steam, you should no longer have any trouble with the Securom activation malarky. Steam will automatically download the different files of the build to update your version to the latest DRM-free version. I cannot test this myself from our European office here, but if it has not been updated for you yet, please let me know in this thread.
I saw reports that the Czech and Hungarian Steam storefronts showed that Sacred 2 Gold was not available in those regions. This was a mix-up, and it's available for these countries too now.
I've looked into the option to offer the Elite Textures from the Sacred 2: Fallen Angel Collector's Edition on Steam. Unfortunately we won't be able to offer these officially without the developer (who went bankrupt) available to guarantee stability with the Gold version. We won't stop anyone who wants to mess around with the Elite Textures from offering them as an unofficial mod or something of the sort, though. While this texture pack added some minor extra graphical fidelity, you won't miss out on any of the core experience without them.
If you already own the Steam version of Sacred 2 (this excludes other versions of the game that do not register on Steam), there should have been a 50% loyalty discount when purchasing Sacred 2 Gold. This doesn't work at the time of writing! Valve is working to resolve this issue, and hopefully this should be fixed soon and at least within the current week. If you missed the Steam sale over the holidays, and own Sacred 2 on Steam already, I recommend waiting until we can confirm the issue has been resolved.
If you haven't seen any of the other threads on these Discussion boards yet, there is a Community Patch that fixes a lot of remaining bugs and adds extra content: http://xmas.ancaria.net/patches/cm-patch0140hf.zip
The Community Patch should work with this Steam version of Sacred 2 Gold, and consists of two executables for enabling and disabling the patch. Run the game once before installing it to counter any initial errors you may receive. (I tried it myself and kind of broke the game in the process, but don't let that stop you because I tend to break everything I fiddle around with.)
Finally, I want to thank the Sacred 2 veterans who have been providing support and help in the Discussions over the holidays! I'm really glad to see the Steam Sacred 2 community springing up into action, and once again I'm sorry it took so long to get the game back on Steam.