Although I cannot say exactly how SCI Studio 4 will work, this would be my impression:
In creating pictures, you will have to specify which version of SCI you're going to be using (which may already be determined by the project file). If you're making an SCI0/SCI01 compatible picture, it will only have the option to save as a vector graphic (that's the official term). If you're making an SCI1+ compatible picture, you will probably only have the option of making a raster graphic (again, technical term).
To me, this method makes sense, although a better way may be implemented in the final, polished version. Regardless of what Brian will do, one thing is certain. SCI Studio 4 must provide support for all types of pictures, including the vector graphics of SCI0 and SCI01, and the raster graphics of SCI1+.