In 4.3, if I needed to edit a function call's parameters, I could type a comma and the parameter Intellisense tooltip appeared.
This was very handy for recalling what the parameter was, but it doesn't work in 5.0 beta 2. The only way I can make the parameter list appear is to type the opening bracket of the function call.
BTW, LOVE the ability to undock tabs to create side-by-side code windows. Much handier than having to switch tabs all the time.