@Killergran: Yes, it seems "This time around, newly recorded voiceovers from the original series cast will be available in either version of the game." 
http://www.adventuregamers.com/newsitem.php?id=2061
Some large screenshots:
http://www.adventure-treff.de/images/bild.php?bild=screenshots/monkeyisland2se_1.jpg
http://www.adventure-treff.de/images/bild.php?bild=screenshots/monkeyisland2se_2.jpg
http://www.adventure-treff.de/images/bild.php?bild=screenshots/monkeyisland2se_3.jpg
http://www.adventure-treff.de/images/bild.php?bild=screenshots/monkeyisland2se_5.jpg
In this screenshot of MI2:SE
http://www.adventure-treff.de/images/bild.php?bild=screenshots/monkeyisland2se_4.jpg
you can clearly see that Guybrush looks way better than in MI1:SE
http://www.adventure-treff.de/images/bild.php?bild=screenshots/monkeyislandse_1.jpg
Good to see that LucasArts listened to those fans of the original who hated the character models used in MI1:SE.
