This probably wont concern 95% of you. But for those who have SLi rigs heres a way to activate it in the BETA (it doesnt work automatically since Nvidia hasnt provided SLi profile for Demigod yet for obvious reasons).
Now since the engine is very similar to SupCom engine you basicly need to create a profile with the same SLi settings as SLi settings profiles provided by Nvidia for SupCom and FA. Sadly enough you cannot do this in the drivers properly (at least its not working for me), cos you cant edit compatibility flags in driver settings. However there is an applicaton that allows you this, it basicly lets you configure anything there is about your GPU (even the options that are normally unavailable in drivers). Here is the link to the tool:
http://www.nhancer.com
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Nhancer can use profiles and to simplify the task for those of you who arent that up on technical aspects i made a profile for SLi for Demigod. All you need to do is import the profile in the application after you run it (file => import).
The profile can be downloaded here: http://files.filefront.com/Demigod+Profilerar/;11704791;/fileinfo.html/11/1
At the resolution i use (2560*1600) the FPS improvement was quite dramatic. insteed of 15-30 FPS i have 30-50 FPS with SLi activated. Full detail, AF 16*, AA 0*.