Kinda hope that Sivir returns to being worthwhile. But not sure I see her doing so.
Lux ult will be nice for interrupts, especially since it is up VERY often.
Poppy/Vayne are nice for LOTS of terrain to knock people into.
AP Shaco should be amazing whichever strategy your team uses. If hit and run, he can deceive away from anything. If 2/3 hunt and defend, he can set up a nice nest to keep your middle spire safe while the two teams fork out and encircle the enemy.
Ori will quite likely be a HUGE nuisance to people with her safe range to harass from, and ability to "hide" which direction she is in when attacking with the Ball to interrupt your channel.