Well, what do you think? The bottom screen looks to be used to navigate through a database of sorts and depict character artwork during gameplay sequences.
So far, Zero Collection is looking pretty spiffy. Here's hoping Capcom will shed some light on extra content and such soon!
[via Rockman Zero Collection official website] Thanks for the heads up, Repliroid20XX.
UPDATE: Upon closer inspection, the menu depicted at the 1:15 point looks to an e-modification card menu...
The Rockman Zero modification cards were cards sold exclusively in Japan in 2004, and when used with Nintendo's e-Reader device, they would make minor modifications to Rockman Zero's 3 gameplay. To accommodate for the lack of an e-Reader, Zero Collection looks to be integrating this system into the game in some way. 'Course, this is just speculation, so don't take my word for it.