Ubisoft updated the official Might and Magic portal with screenshots of the Heroes V cut scenes (in other words, the animated sequences that play between each mission of the single-player campaigns). Notice that they all use the game's engine. Since the links there are not working so well, you can use those included in evilp's thread at the Round Table.

Ubisoft also sent Celestial Heavens exclusive versions of the screenshots with subtitles, so that you can actually find out what's going on. The Dungeon campaign appears to be quite interesting, don't you think?