Thanks guys for your help. Sorry i didn't check this forum for days.
I gave the demo a try. It worked but didn't really say anything useful other than "congrats". The demo looked smooth and FPS I got was around 25. Anyway, I've preordered it. It's my first new title in this 15 years :)
re graphics memory. I see that the max memory size is 1.7GB, which is around 1/4 of the system memory, and the size in use is 245MB. I guess you're right. It seems it can use main memory if necessary.
Lexor: Yes, but if I read correctly, HD 3000 in this laptop has 384MB memory, while game minimum requirements list 512MB. I'm not saying it will not run, but developers are going to do tests with 256MB+ memory cards so we can not be 100% sure at this moment.
GoingDown: Intel HD graphics 3000 uses machine main memory as video memory, so in theory it should be able to use at least 1/4 of system memory. There might be bios restrictions for this though.
EDIT. I have Lenovo laptop with Intel HD Graphics 3000, and in my case the Intel Graphics configuration program says that maximum video memory is around 1,6GB. Can you check from there? (Click desktop with right mouse button, select Graphics properties. In there, you should find out "Information" or something similar)