I’ve only seen the trailers, but they were kind of restrained with the CGI, and at least attempted to stay true to the look of the strip. Pity Fox seems more interested in Blu Sky Studios cranking out more Ice Age sequels than doing something new.
And when was the last Peanuts theatrical feature? 1980?
I agree–the CGI was very subtle. The 3D appearance was accomplished through relatively (compared to other 3D animation) restrained shadowing.