Don't get too married to the banned and exempted lists. There is still the list of items on the gun, and if they go to the one item plan our Ruger 10/22's will be banned (detachable magazine) 
Reading the draft version of S.150, as provided by PegLeg45 (
http://www.downrange.tv/forum/index.php?topic=21754.0), would indicate that a rifle accepting detachable magazines is not automatically defined as a "semiautomatic assault weapon." To qualify, the rifle must accept detachable magazines
AND have
one of the features specified in the 'characteristics list.' The same is true for handguns - accepts detachable magazines
AND has
one of the listed features. With this in mind, the Ruger 10/22, in standard factory dress, would not be banned.
In general, I think it is more useful to focus on their 'formula' for a 'semiautomatic assault weapon' rather than the two lists. I see those lists as an attempt to show how innocuous the ban really is... as in "Look, we're letting you keep over 2000 and we only want about 150 or so - see how harmless this is?"
The bill's THOMAS text should be available soon and we can see if it differs from the draft version linked above.