I thought that you could still connect to a 432+ server with an older client, just not as spectator or something?!
About the scoreboard ... :
DividedSky,
No, that's not what they did to to make more players on the scoreboard.
I guess you play UT on 1024x768? Perhaps you havn't seen an other trick that Epic introduced with 432: When you have too many players for the scoreboard, so that some names drop off the bottom, the scoreboard will be "compressed" (distance between lines reduced and some info removed) after 1 or 2 seconds, so that you can see all players.
If you compare the old scoreboard and the new scoreboard, you'll see that the PL info would fit into the new scoreboard easily. There is still plenty of space to display it:
Old:
New:
(Don't pay attention to the names on those scoreboards, I picked those screenshots only to show the effect.
It's not important in this context that I kicked Gouryella's ass.
)