About the sync, we hope that it is true. Vids are nice, but vids are not always the real thing.
500 players is just crazy. Look at the chat with 100 players, and think of 5 times the amount...admins will need a speedreading training.
Think you can put 500 player dancing on a place like Disney without mass crashes in SA:MP ? Well I hope they know what they are aiming for, and that they reach it.
Our new scripts are for the current version, not 0.2.5 but if it comes out we are sure to extend it using whatever useful new features are there.
Lets just hope that before developing the new things, the team has spend as much attention on improving the current ones.