How i can connect 2 projectors and make multi-screen (both 2 projectors make 1 square).
Yes, but not directly out of Modul8 without some tweaking on your own. There has been some hinting that Soft Edge Blend would be a feature of Modul8 3.0. BTW It is possible to do up to 7 projectors with a maxed out Mac Pro and 3 with a MacBook Pro and Matrox Triple Head2Go. You can do what you are asking but without a soft edge blend it will not look professional.
DeepVisual has an option.
http://www.youtube.com/watch?v=Lxfd9RiVVxE
How i can make and correct work area ( sphere form for example or more difficulty ).
This question is much harder to answer. I have found shapes that are not square or cubed are tough. Circles and Spheres are doable but Mapping non-cubed/square stuff is not simple out of the box without lots of preproduction. I am working on a 3 foot dodecahedron right now and it is challenging to say the least.
Can i upload spline forms from photoshop ( for example ) ?
I am not really sure what this is. If you mean 3D wire images then no. If you mean .jpg, .png+, .psd+, and almost any other image file Photoshop can do then yes.
Any modules for mapping special?
MapMapMap and Mask (global)
MadMapper is not here yet but all indications are it will be sweet!
http://www.modul8.us/?p=474