I think there would be a nice little bit of poignancy when Bond says "no one ever takes the time to do a serious interrogation anymore. It's a lost art" had it been Pushkin, given the excellent scene in TLD between Bond and Leonid.
That said, I think I'm more curious about Pushkin's return as Zukovsky's character, though we'd have to lose the excellent 'I gave him the limp' line.
As for Tcheky, I like his steeliness, and how he plays off both Ourumov and Bond.