Personally, I considder this Pico 2.
All Pico 2 jokes aside, I see this as Pico 2. Sure it wasn't a "travel and shoot" adventure or anything, but it may as well have been the thing everybody says isn't coming out. That's just my opinion of course, and I know there are people who are sticklers about names. 'This is Pico vs. Uberkids, not Pico 2, you fucking moron!'
But seriously. The artwork is the same, the characters are the same, the author is the same, the setting is the same. Just because Halo Wars isn't a first-person shooter doesn't mean it's not Halo IV.
I actually like this one better than Pico's school.