There is an interview with Atari project manager Keewhan Her in the latest issue of G-Fan magazine. Most of the info is old but there was one part that I found interesting.
For one of the questions G-Fan asked Keewhan in what ways does the new game differ from the last two?
He responded "Godzilla Unleashed represents a leap in evolution in Godzilla games. The Wii version has 44% more monsters than Save the Earth (8 more than STE, 14 more than DAMM), including two brand new original monsters, five Toho monsters never before seen in any previous Godzilla game...etc."
This interview was probably conducted a couple months ago so things may have changed since then...but maybe not. (at least it gives us something new to talk about)
The math is also a little odd.