I visited Digiexpo on Saturday mid-day and the place was packed full. You had to wait to play all the games, thus my coverage ended up pretty slim since my stay in Messukeskus mostly involved watching others play. Otherwise the event gets thumbs up in my book.
In Nintendo's expo area, people were playing Wii Sports and the usual stuff along with some new Wii & DS games like Super Mario Galaxy, Metroid Prime - Corruption & Zelda - Phantom Hourglass. I got my hands on Mario Galaxy and i can tell you, the controls felt very intuitive and the visuals looked great as i expected.
Microsoft was displaying their latest games and i could not spot any pre-release games in a quick glance.
EA was running the show. Displaying tons of new games & even titles not released yet. Amongst the games there were, My Sims, The Simpsons games, Crysis, New sport titles & other coming soon titles. EA was showing off games on almost all gaming platforms.
In Sony's area Playstation 3 & PSP games were most prominent. Playstation's Home service was quite visible in their expo setup and decoration & was perhaps the most innovative set decoration in the whole expo area. Their set had different areas for different types of game genres and actually these areas were filled up with gamers typical of that genre. EDIT: Apparently Sony had some pre-release games that you could play also.
Some of the games magazines from Finland were also present, at least Pelit & Pelaaja. Near Pelaaja area the biggest attraction seemed to be Guitar Hero III.