Has any thought been given to maybe moving the Vader/Palpatine scene earlier in ESB, perhaps even as the 1st scene in which we see Vader? The most I know is Ady is altering the dialogue a bit.

In Ady's trailer it's amazing that the scene's dialogue works so well as a set up for the entire film so it just got me thinking perhaps it could be much earlier?

Then there wouldn't be the issue of "does Vader know or not know of Luke during that key scene" - considering he'd already been searching for Luke by name at that point anyway.

The scene later on where Vader is told the Emperor wants to speak with him would simply have to be cut short.

According to George Lucas at CV - that was in fact the moment Vader learned for certain Luke was his son. (for what it's worth)

Anyway - just thought I'd throw it out there for the sake of possible discussion.